Boat Navigation Lights Rules: Illustrated Beginners Guide

When navigating at night, the lights on other boats are your first clue about the moving dangers around you. And your navigation lights are your first line of safety in avoiding collisions in the dark, and they tell others vessels what you are and what you are doing. The rules sound complex, but with a little understanding you can get the basics for any situation.

So what are the basic navigation light rules? For most small vessels, motoring requires red and green (port and starboard) lights, and a white light visible in all directions around the boat. This is almost always a stern light and a masthead light on sailboats. Boats under sail require port and starboard lights, and a white stern light. Sailboats below sixty-five feet may show a tricolor light at the masthead instead of side and stern lights when sailing.

That's it, in a nutshell. There's a little more to it, as the rules change with different sizes and there are some specifics about angles of display for the colors. Identifying other ships at sea requires more study, but the basics are the same. And it's not much trouble to make sure you've always got the proper lights on your vessel.

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On this page:

What are the official colregs rules for your sailboat, what about the uscg (united states coast guard) rules, lighting at anchor, identifying the boats around you.

The International Regulations for the Prevention of Collision at Sea , abbreviated "COLREGS" is very specific about the lights required, their shapes and sizes, and the distance they must be visible. For the smaller boat, the following definitions apply.

  • Masthead Light - a white light placed centerline on the boat showing an arc of 225 degrees with 112.5 degrees either side of the front of the vessel.
  • Sidelights - A red light on the port side and a green light on the starboard. They must show an arc of 112.5 degrees from centerline of the bow.
  • Stern light - A white light on the stern of the boat showing an unbroken arc of 135 degrees from centerline of the vessel.
  • All-round light - A light showing in an unbroken arc of 360 degrees.

The good news is you need not measure these angles. Any properly installed USCG or COLREGS approved light which will cover the correct arcs. If you have to replace the original light from your boat, make sure it's with an approved replacement.

Lights When Sailing

sailboat night light requirements

The specific rules for a sailboat under sail are in COLREGS Rule 25 and vary slightly with the size of the boat. A sailboat powering is considered a power boat and falls under in Rule 23.

  • Under 23 feet (7 meters) - side lights and a stern light, possible. If these lights can not be displayed a light must be kept at hand to help avoid a collision. This can be a bright flashlight.
  • Over 23 feet - Side lights visible to one nautical mile and stern light visible for two.
  • Vessels under 65 feet may combine both sidelights into a single lantern on the bow.
  • May show a tricolor light on the masthead instead of sidelights and a stern light. It's one or the other though, do not show these lights at the same time .
  • Masthead light must be visible for three nautical miles, all other lights must have a two nautical mile visibility.
  • Side lights must be separated.
  • May not show a masthead tricolor light.
  • Masthead light must have five nautical mile visibility, all other lights must be visible for two nautical miles.
  • Optional masthead lights - any vessel under sail may display a red light over a green light at the masthead with sidelights and stern light. The red over green may NOT be displayed with a masthead tricolor light. It's one set or the other.

Lights When Motoring

sailboat night light requirements

For all navigational purposes a sailboat under power is considered a power boat. This includes motor sailing - if the engine is on and providing propulsion you are on a power boat, even if the sails are up . This applies to navigation lighting, sound signals in fog and limited visibility, and rights of way.

Sailboats under 50 meters under power need to show:

  • A masthead light
  • Stern light

A power-driven vessel under 23 feet (7 meters) that does not exceed seven knots of speed may display an all around white light, though sidelights should be used if available.

sailboat night light requirements

The USCG has published its own "Rules of the Road" that are based on the COLREGS. In addition, it has rules for the "Inland Waterways" for rivers, inland lakes and the Great Lakes.

The good news is this has no impact on what you have to do with your own boat.

They mostly relate to lighting changes on towed vessels like barges and tugs. For example, a vessel towing or pushing another vessel in the ocean under COLREGS shows two masthead lights, sidelights and a stern light, whereas in Inland Waterways the towing or pushing vessel displays two yellow towing lights instead of a white stern light.

If you sail on lakes, rivers or the Great Lakes where towed commercial traffic is common you should learn the inland lights, but coastal or ocean sailors will never see these.

When you anchor outside a designated mooring field, you should display an all around white light at the masthead or as high in the boat as practical.

sailboat night light requirements

If your boat is large and has a very tall mast, you may wish to display another light closer to the waterline. Boats approaching in the dark may not see a light on a mast sixty or seventy feet in the air when they are close to your boat.

We use a simple garden path light on our stern when we anchor, left in a rod holder or flag socket. It comes on automatically at dusk and is a cheap and easy way to be more visible. There is no specific rule stating you can not display more lights than required, or the nature of any lights beyond the required all around light.

The COLREGS also specify that a round black "daymark" should be displayed in the rigging of any vessel at anchor. Very few small vessels observe this, however it is the correct display for a vessel in an anchorage.

If you tie to a mooring in a marked mooring area you are not required to display anchor lights, but there is no harm in doing so.

The other important reason to know your lights is to figure out what's going on around you at night. The water may be ablaze with white, red, green and other lights at night and they are your first key to avoiding collisions and problems.

All combinations of lights for fishing boats, commercial vessels, and so on are outside this post‘s scope. The odds are small you will encounter a submarine, seaplane or hovercraft at night, but there are regulations regarding specific lighting for each of those vessels!

There are a few fundamentals to help you figure out what that is you see on the horizon, which way it is going, and whether it is a danger to you.

Port Wine is Red

The fundamental rule is that red sidelights will ALWAYS be on the port side of a vessel, and green lights will always be on starboard. However, some vessels can use all around red and green lights for other purposes, though those will be higher than sidelights.

Diagram for identifying boats at night

The light‘s on a ship is not important, some large tankers and freighters will have their sidelights far aft and put them on the superstructure for better visibility. It is not safe to assume that sidelights you can see are on the bow of large vessels .

When you can see the color, you know which way the bow is pointing. If it's red, it's pointing more or less to the left and will travel in that direction. A green light shows it is heading more or less to your right.

If you can see the red and green lights at the same time, you are looking directly at the bow of the vessel. When you are far away, this isn‘t as alarming as if you are close crossing. Seeing red and green lights together on a vessel is something you never want to see for long.

Be aware of red and green lights used in combination with other red, green and white lights. These may not be running lights and could have other significance.

Tankers, Freighters and Large Ships

Tankers, freighters and large ships will have side lights, a stern light and a masthead light. In addition, on vessels over 50 meters there will be a second masthead light further aft and higher than the forward light. The masthead light positions are a better tipoff to the bow direction and how far from the bow the sidelights might be. Remember - on a large vessel the sidelights may not be at the bow or even close to it.

USCG Inland Rules allow for a second all-around white light on large vessels on the Great Lakes instead of a second masthead light.

Fishing Boats

Fishing boats engaged in fishing will have more complex light displays. When they aren't fishing, they will show lights like any power vessel, but Rule 26 spells out light combinations that vary by the fishing activity being done. In general:

  • Boats which are Trawling but not making headway will display a green all-around light over a white all-around light , and a masthead light aft of these lights. Boats making headway while trawling will show these lights, plus sidelights and a stern light.
  • A vessel fishing other than trawling will show a red all-around light over a white all-around light . When making way they will also show sidelights and a stern light.
  • If a vessel has gear more than 150 meters away from the boat, it will show a second all around light in the direction of the gear. The best rule is to give fishing boats as wide a berth as you can at night. They're easy to pick out if you check the top light configurations but their course may be difficult to predict.

Towing and Pushing

Towed vessels can be the most dangerous to cross, but they have the most lights to tell you what is happening. Refer to COLREGS or the USCG Rules of the Road Rule 24 for all combinations You can pick a tow/push vessel out with the following lights:

  • Two or three masthead lights in a vertical line. Three masthead lights shows a tow over 200 meters. Additional masthead lights may show for larger tow vessels.
  • A towing light (yellow light with the same characteristics as a stern light) directly above the stern light.
  • The will also have side lights and a stern light.
  • The towed vessel will show sidelights and a stern light. Lighting may vary under USCG inland rules, where towing lights may replace stern lights. Learn these differences if this is your regular cruising ground. If you think there is a tow ahead of you, always go well behind the aft most set of lights. Never go between a tow and avoid crossing ahead if possible as it may restrict their maneuverability.

Special Situations

There are several rare situations you may encounter. As a general rule, if there are a lot of lights and you don't understand them look for the sidelights on a moving vessel. If you can find them and figure out the direction it is moving, it makes the vessel easier to avoid. Stay well clear of lights you do not understand if you can avoid them without risk.

Most of these signals are used by larger, commercial vessels and you will not need them.

They use these light combinations with other light combinations. For example a towing vessel may also be restricted in maneuverability, and a vessel constrained by draft will show running lights if moving.

  • Not Under Command - two all around red lights in a single line
  • Restricted in Ability to Maneuver - red, white then red in a single line
  • Constrained by draft - three all around red lights

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Boat Navigation Lights: Everything You NEED to Know (2024)

rob

In many cases, boating at night requires the use of boat navigation lights, but boaters often have many questions about them.

They often wonder when they’re needed, what the requirements are for various locations and vessels, and more.

We’re going to do a deep dive into navigation lights for boat to see what you need on your boat, and when you need to use them. 

Legal Requirements

Types of navigational lights, which navigation lights are required on my boat , operators responsibility  , navigation lights .

On any vessel operating on or in US waters, there is a need for the operator to display navigation lights under certain circumstances. Their purpose is to make vessels aware of each other at night or in times of generally reduced visibility. This is incredibly important during times when you may not be able to see the craft itself.

Other than visibility, marine nav lights also help boat operators determine the size, direction of travel, and even the potential activity of another boat on the water. When an operator understands the type of information each light tells them, they will be better able to determine appropriate courses of action for potential situations.

Boat running lights are divided by location and color, and each of them has specific requirements with how they must be displayed and perceived. You are the one legally responsible for displaying proper nav lights on the boat, for displaying them at the proper times, and for understanding how to read them.

The US Coast Guard ’s legal navigation light requirements include guidelines for every aspect of light usage.

Their materials start by first defining the standard daily period during which they must be used, then they detail how many of each type of light is needed as well as where they are located. Each light also has constraints regarding its visible distance and the arc over which it can be seen. 

In the US, the Coast Guard says that any powered vessel that is under 39.4ft., may operate with boat nav lights in as little as two positions, an all-round light at the stern, and a set of sidelights at the bow. 

Vessels that are under 164ft. must have lights displayed in four positions, a stern light, a masthead light, and boat sidelights on both the port and starboard, near the bow.

The ship navigation lights also have minimum visibility distances, depending on the size of the craft. The minimum visibility for nav lights, even for small crafts, is one mile, with requirements that other lights on larger vessels be visible for up to 3 nautical miles.

Also read: Boating Rules and Etiquette On the Water

Boat lights come in 4 types, sidelights, stern light, masthead light, and all-round light. Lights only come in white, red, and green, and all have very specific jobs.

Masthead Light

The masthead light is the white light located about ⅔ of the way up the mast, rather than at the top as you’d think. This boat bow light is required when using motor power at night. To be acceptable, the light must have an arc of 225° and needs to be seen from 2 miles away.

Large boats can have up to 3 mast lights. If your boat is shorter than 39 ft., all 2-3 white mast lights can be combined, utilizing one larger white light at the top of the mast.

Color : White ARC : 225 degrees Position : Front of boat

Port Sidelight

The boating lights located on the port side of the watercraft are red and mounted so that boats can see as they approach either head-on or from the left. This light helps tell if a boat is coming towards you or if it is pointing away. The phrase “red, right, returning” means that if you see a boat with their red navigation light on the right, they are facing your boat. The only time it is not needed is when your boat is anchored for the night .

Color : Red ARC : 122.5 degrees Position : Forward, left side

Starboard Sidelight

If you are to approach a boat from the front or right, you will see the green starboard sidelight. With an ARC of 122.5 degrees, approaching boats will be able to see yours easily.

This light helps tell you whether or not you have the right of way, which is important when it comes to keeping both you and your passengers safe. These are some of the front boat lights.

This light will often be combined with the port light, in small boat navigation lights. When out in the water, if you see the green light, that means it is safe for you to go, as you have the right of way.

Color : Green ARC : 122.5 degrees Position : Forward, right side.

The rear boat light is called the stern light. It is used to mark the rear of the boat. The operator can infer from only setting a boat stern light, that they are directly behind the vessel. 

The stern light is white and is visible for an arc of 112.5 degrees on both the port and starboard sides, making a full arc of 225. Being able to see the red starboard side light as well as the stern light, should indicate the other vessel is traveling to the right from the perspective of the observer. 

Color : White ARC : 225 degrees Position : Stern

All-Around Light

One of the boat night lights that is required when on your boat between sunset and sunrise is the all-around light. This light is intended to be seen from any point and helps to tell what direction a boat is moving. This light is also used when a boat is stopped or anchored.

This anchor light is required to have an ARC of 360 degrees and should be visible for two miles. The all-around light is white and it is located at the top of your boat’s mast for maximum visibility.

Color : White ARC : 360 degrees Position : Top of mast

Tricolor Light

A tricolor light is a sailboat mast light that has your three types of bow light in one convenient piece of equipment. They are for sailboats that are smaller than 65.6 feet long. The point of this sailboat light is to increase your nighttime visibility. They are mounted at the top of the mast, allowing larger boats to see yours better. They are not permitted to be used by any boats with a motor. The only type of boat that can utilize a tricolor light is a sailboat.

Color : White, red, green ARC : 360 degrees Position : Top of mast

Towing Light

These yellow lights are important, as they indicate to other watercraft that, not only is there another boat nearby but that they are also towing someone as well. The light must be positioned at the back of the boat, as close to the stern as possible. The goal is to avoid having anyone run into the boat that is being towed, as there may be no lights showing where that boat is located. The boat lighting requirements when towing state that both sidelights, a stern light, and masthead lights should also be displayed.

Color : Yellow ARC : 135 degrees Position : Over fore and aft centerline of the boat

Law Enforcement Light 

Lights used by law enforcement on the water are flashing blue lights that can flash 120 times per minute or more. They can be used nearly anywhere that is convenient for the operator, provided they do not interfere with the function of the other lights.

This light may be displayed by any type of local law enforcement that is engaged in the course of their duty. This can apply to local, state, or federal police, as well as officials from wildlife and conservation departments, the Coast Guard, and more.

Color : Flashing Blue ARC : 180-225 degrees Position : Anywhere not interfering with other lights

Find your boat type below for the lineup of nav lights that you will need to safely operate after sunset and in other times of limited visibility.

Be sure you know which lights you will need to have on while underway, as well as at anchor or while towing. If you’re sailing, don’t forget that you are considered power-driven when using your motor.

Powerboat under 23 feet (7m) 

Powerboats under 23 feet are required to have the following navigation lights displayed:

  • One white masthead light visible for 2 miles
  • One red & green sidelight visible for 1 mile
  • One stern light visible for 2 miles
  • One white, red, green, or yellow all-round light visible for 2 miles

Powerboat Under 39,4 feet (12m)  

Powerboats under 39,4 feet are required to follow these boat light rules:

  • One all-round light visible for 2 miles

Powerboat Over 39,4 feet (12m)  

Powerboats over 39,4 feet are required to have the following navigation lights displayed:

  • One white masthead light visible for 5 miles, unless less than 20 meters, then 3 miles
  • One red & green sidelight visible for 2 miles

Powerboat 39,4 feet (12m) to 164 feet (50m) 

Powerboats between 39,4 feet and 164 feet are required to have the following marine running lights displayed:

  • One white masthead light visible for 6 miles
  • One red & green sidelight visible for 3 miles
  • One stern light visible for 3 miles
  • One all-round light visible for 3 miles

Sailboat Under 23 feet (7m) 

Sailboats under 23 feet are required to have the following sailing navigation lights displayed:

  • One white stern light
  • One white mast lantern positioned at or near the top of the mast where it can be easily seen from a distance

Note: if it is not practicable for the vessel to display the prescribed lights, one all-round white light can be used or a hand torch, with enough time to prevent a collision.

Sailboat Under 65,6 feet (20m) 

Sailboats under 65,6 feet are required to have the following sailing lights displayed:

Tug Boat With Tow Length Under 656 feet (200m) 

Tug boats with tow lengths less than 656 feet are required to have the following navigation lights displayed:

  • Two masthead lights in a vertical line
  • Stern light
  • Towing light in a vertical line above the stern light

Tug Boat With Tow Length Over 656 feet (200m) 

Tug boats with tow lengths longer than 656 feet are required to have the following navigation lights displayed:

  • Three masthead lights in a vertical line
  • A towing light placed vertically above the stern light
  • A diamond shape visibly displayed

Anchored Vessel 

Vessels at anchor or aground are required to observe the following boat lighting rules:

  • One white all-round in the fore
  • One white all-round at a lower level than the fore, at the stern

If aground, the vessel should display two red all-round lights in a vertical line

Vessel Under Oars 

Vessels under oar power have similar requirements to follow as small sailboat lighting:

  • One stern light

Or, alternately, one white all-round light or hand torch to be used to manually signal to avoid collision

Vessel Engaged in Fishing 

Vessels actively engaged in fishing are required to have the following marine navigation lights displayed:

  • Two all-round lights oriented in a vertical line, red on top and white on the bottom
  • One all-round white light for gear more than 150 meters from the vessel
  • When making its way through the water, there shall also be sidelights and stern light

Vessel Engaged in Trawling 

Vessels engaged in trawling are required to fulfill the following boat light requirements:

  • Two all-round lights oriented in a vertical line, green on top and white on the bottom
  • One masthead light abaft and higher than the all-round green

Kayakers and Canoers 

Kayakers and canoers are required to have the following navigation lights displayed:

Alternatively, a hand torch or lantern which can be used to signal to avoid collisions

Personal Watercraft 

There are no established rules for navigation lights on personal watercraft, even though many of them are classified as a boat by coast guard standards. Personal watercraft are often not permitted to operate outside of the sunrise-to-sunset period, and so most manufacturers do not install or make possible the installation of navigation lights. 

Vessels Restricted in their Ability to Maneuver 

Vessels restricted in their ability to maneuver are required to have the following navigation lights displayed:

  • Three all-round lights displayed as high a possible in a vertical line, red at the top, and white in the middle
  • One masthead light

The USCG as well as state authorities hold the operator of the vessel responsible for the correct use and understanding of nav lights.

This means they also must make sure all of the lights used meet the requirements set forth by the authorities.

This also extends to ensuring that the lights are all installed for optimal visibility while underway, so if your cruiser rides high, make sure your lights are still visible.

What navigation lights do I need on my boat?

Boat light regulations state boats must have a pair of red and green sidelights, and an all-around white light that can be seen from 360°.

Why are navigation lights red and green?

Navigation lights for boats indicate to others which direction a boat is facing. The red indicates the left side of the boat, green is on the right.

What lights need to be on a boat at night?

Per the navigation lighting rules, it is crucial that you have your red and green navigation lights, as well as the white 360° light.

Which three colors are used for navigational lights?

The boat light colors are going to be green, red, and white. If you see a blue light, this generally indicates a government vessel.

Do I need navigational lights on my boat?

Yes, all boats are legally required to have the minimum red, green, and white boat safety lights

 when operating in the dark.

Why do boats have blue lights?

When you see a boat that has blue boat lights at night, that means that it is likely the coast guard or law enforcement.

Why is port red and starboard green?

The light on the starboard side of the boat is green because it is ‘safe’, as the steersman will be able to see other boats.

What does a single white light mean on a boat at night?

If you can only see a single white light on a boat at nighttime, you are likely seeing the stern light or the boat anchor light.

rob

Robert Owens is the Chief of Content of Quicknav. Robert has been boating for over ten years and loves to share his experience on the water. His first boat was a dirt-cheap moderately beat up 2003 Bayliner 175, where he learned a tremendous amount about trailering, launching, docking, operating, and maintaining. He currently owns a Cruiser Yacht and is eyeing a sailboat.

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Navigation Lights for Sailboats (And How To Read Them)

Navigation Lights for Sailboats (And How To Read Them) | Life of Sailing

Last Updated by

Capt Chris German

June 15, 2022

Navigation lights on a sailboat can be confusing. If you understand the reason behind why they are the way they are however, they can make a lot more sense.

At their heart, sailboats are really just a power boat and as such must adhere to all power boat rules such as navigation lights. Other times however, a sailboat is classified in a special category. They have a set of additional lights they CAN show as an option, but are not always required to do so.

That’s about as clear as mud if you ask me and I contend that that is where the confusion about lighting a sailboat begins.

Just because you can show a light to identify yourself in times of low visibility, does not mean you have to and then we add in a little sibling rivalry between power and sail and things get downright adversarial when it comes to navigation and the night.

Table of contents

The USCG says You’re a Power Boat Whether You Like It or Not

Much to the consternation of many a sailor who has earned a commercial license to drive their sailboat, when you received your credential from the USCG it says you are a master of steam and power across the top with no mention of wind as a source of propulsion.

It is not until you read the back pages of your little red book that feels like a passport and looks like a US Sailing credential, that you will see the term “sail auxiliary”. That is because most of the time the U.S. Coast Guard knows that you are primarily reliant on your mechanical power to propel your vessel.

It's a sad thing, but the days of commercially viable sail boats are done and all but the most select few even have sails let alone use them as their primary power source. All sail boats by law are powerboats, but not all powerboats are sailboats.

Navigation Lights for a Power Boat

As a power boat, you are required to show certain lights and have been required to do so before power was even invented. 

In the days of man powered vessels like the viking ships who relied on oars while in close quarters to power their vessels, they needed to show other boats, friend or foe, where they were by showing lanterns in the dark to identify themselves. As you know, it is a time honored rule among all the nations of the world both past and present, that you must avoid a collision at all costs while at sea and even the viking knew that you should not run into things.

By lighting the front and back of your boat, you could warn other boats of your presence as well as identify which way you were heading. As such there is a very specific rule in the Code of Federal Regulations Number 46 (CFR46 by common name) that spells out with detail how many, the color, the luminosity or brightness, the angle of visibility and the location of all of the lights required for navigation on every single boat, seaplane, submarine and other nondescript vessel conceived by man to date that they must show while underway in reduced visibility.

And there is no flexibility in the rules.

As such a power boat, and by extension all sailboats, MUST, without question show one green light on the starboard bow and one red light on the port bow and one all around white light or lights while operating in reduced visibility. These lights should shine at all 360 degrees of visibility with the bow lights shining at an angle of dead ahead to 22.5 degrees abaft the beam and the stern lights shining 225 degrees dead aft. A forward facing masthead light that is white in color shall shine forward to comply with the directive that all vessels must carry an all around white light. For more read here .

As you can see, there isn’t much wiggle room when it comes to lights that must be shown.

Sailboats get a little flexibility with lights

Sailboats however, are a little different when they are in fact sailboats, which is only when you are entirely reliant on the wind for power and in no way reliant on any mechanical or manual means of propulsion. And for good reason.

Back in the day when men were men and sailboats were wooden, fire was a major concern. Sails were coated with wax and other flammable substances and the wood on boats was saturated with oils and grease. Even the ropes were plant materials saturated with oils to keep them pliable and strong.

Add those highly flammable substances to a parching environment like the sea and you had what was essentially a giant floating tinderbox.

Then tell that giant floating tinderbox that they need to identify themselves to the world at large at night using oil lamps with flames because batteries and lights were not invented yet. It didn't take very long or very many ships burning to the water line for the Governments to say to the sailboats, you get to do things a little different.

As such, sailboats are given special dispensation when it comes to lights aloft. They don't have to show an all around white light in their rigging because no one wanted to set their rig on fire with oil lamps 60 feet up in their rig.

However, when a sailboat takes their sails down such as when they are powered or at anchor, they must resume the display of an all around white light or lights aloft. That became a real challenge with aluminum masts and the disappearance of rat lines on the shrouds because there was no easy way to climb the rig and check the bulbs up the mast on a regular basis. 

Red over Green Sailing Machine

I have no idea where the history of this particular light comes from, but if you ever take a deck exam with the USCG, you better remember this mnemonic. An all around red light over an all around green may be displayed on a vessel during times of reduced visibility to indicate that a vessel is operating under sail power alone. 

I won’t even speculate on how or why they came up with this particular light configuration, but if you want to use these lights as a sailing vessel, you can do so, but that means that you will need three all round lights at the top of your mast, an all around white, an all around red and an all around green, just in that order.

The red over green is to be displayed in addition to the running lights or the red and green bow lights with the 225 degree stern light. As always, when the motor comes on, so does the steaming light or the forward facing white light that is also usually about ¾ of the way up on your mast to complete the requirement of an all around white light that indicates a power vessel.

What is a “steaming light” and why are you mentioning it now?

Most sailboat electrical panels will have a switch that is labelled “steaming light” and it will only come on when your anchor light is off. This is probably the most confusing part of sailboat navigation lights so if you are confused about this, you're in good company as most people are. 

A “steaming” light is named thusly, going back to the days of steam powered sailboats where when they fired up their boilers and doused the sails, they became a power boat once again. There aren’t too many steam powered boats, let alone steam powered sailboats, but the name stuck and it is a vestige of a bygone era.

Either way, when you fire up your motor, you turn on your “steaming light” and that locks out the all around white light which is used for anchoring to minimize the number of switches on your panel and reduce the number of wires in your mast. The fewer wires, the less chance of something not working or becoming disconnected.

The steaming light and the anchor light both go up the mast, but you can’t use an all around white light while using the 225 degree stern light at the deck level because to other boaters you would look like you have two white lights from the stern and that would be confusing.

The anchor light is used exclusively for anchoring while the steaming light is used to indicate you are a power vessel while underway.

As to why I am mentioning it now in the article, is because this would have blown your mind if I started with this subject cause it can be really confusing stuff.

Aspect Recognition with Lights

Remember when I said earlier that lights can help you tell others which way you are heading as well as tell you which way other boats are heading? That is called the aspect of the vessel and the USCG tests you on this for your deck exam as well. 

Knowing that the bow lights go 22.5 degrees abaft the beam on both sides or 112.5 degrees on each side, and the stern light faces 225 degrees aft for a total of 360 degrees of visibility, you can tell a lot about where a boat is heading and who has the right of way.

One thing that's easy to remember is red means stop and if you see a vessel's red light, it means stop as you are the give way vessel and approaching the other vessel from his port side. Conversely it works with green as well as that means you are approaching from the other vessel's starboard side and you are the standon vessel.

If you see a red and green light equally low on the horizon, that means your heading dead on into another vessel's path and conversely if all you see is a white light low on the horizon, it means you are overtaking another vessel power or sail, we don’t care because it is an overtaking situation. However, any time you do see a white light aloft in addition to the red and green bow lights, you know you are encountering a power boat.

Then there are angular approaches as well, where you see white and red or white and green light low on the horizon. You know in that case you are seeing a portion of the bow lights and stern lights from the side approaches of a vessel. Based on which direction those lights are heading, you can deduce which way that boat is going in relation to your boat.

So put it all together and you see a green light and a white light low on the horizon with a red over green light aloft, you know that you are approaching a sailboat that is traveling to your port and that might make you the standon vessel. That is of course, if we didn’t concern ourselves with windward and leeward and port tacks and starboard tacks, but that is a discussion for another article. So stay tuned when we talk about sailing rules and the right of way. But for now, do good, have fun and sail far.

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Capt Chris German is a life long sailor and licensed captain who has taught thousands to sail over the last 20 years. In 2007, he founded a US Sailing-based community sailing school in Bridgeport, CT for inner city youth and families. When Hurricane Sandy forced him to abandon those efforts, he moved to North Carolina where he set out to share this love for broadcasting and sailing with a growing web-based television audience through The Charted Life Television Network.

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Navigation Lights for Sailboats (And How To Read Them)

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Boat Navigation Light Rules and Requirements

sailboat night light requirements

Boat navigation lights are one of the most important pieces of safety equipment on your boat, along with personal flotation devices , boat fire extinguishers and boat ventilation systems .

As a boat owner or operator, you are legally responsible for using the correct safety equipment at all times. This is your responsibility whether your boat is moving through the water or you are at anchor, day and night, in all types of weather.

Did you know that boat manufacturers, importers and dealers are not responsible for equipping your boat with legally acceptable navigation lights ? Before you take to the water, check that your navigation lights are:

  • the right size and type for your boat and chosen water activity
  • the right color and intensity
  • attached to the correct parts of your boat
  • fully operational.

It’s important to learn all you can about navigation lights for safe, legal boating! Keep reading to find out which lights to use when.

What are navigation lights for?

Navigation lights allow you to see and identify other vessels, and allow other boats to see and identify you. There is not one simple way to use navigation lights; the way they are set up on your boat will indicate the size, activity, and direction of travel of your vessel, so that you and other boat operators can make good decisions and avoid collisions.

By understanding what navigation lights mean, you will be able to safely and legally navigate shared waters under a variety of circumstances.

Boat navigation light requirements

Paddleboats, rowboats and small sailboats generally do not need to display navigation lights, but most other boats are legally required to use some or all of the following:

  • A green light to indicate the starboard (starboard sidelight) attached near the bow on the starboard side
  • A red light to indicate the port (port sidelight) attached near the bow on the port side
  • One or more white lights (stern light and masthead light)
  • Other navigation lights , such as blue flashing lights for law enforcement vessels engaged in search-and-rescue (SAR) operations, or yellow lights for vessels that are towing or being towed

Each type of navigation light also has a defined arc of illumination and range of visibility. Angles of visibility must be met when the boat is underway, which means that if your boat rides at a significant bow-up angle, you may need to adjust your navigation lights to compensate.

You must always use navigation lights between sunset and sunrise or in reduced visibility, but there are some exceptions during clear, daytime boating.

Note: It is also important to keep a flashlight on board as a temporary replacement, in case a navigation light burns out.

Boat navigation lights while underway

While your boat is underway, you are legally responsible for displaying the right type of navigation lights. Choosing the right lights depends on several factors, including:

  • Whether your boat is powered by an engine (in full or in part)
  • The size of your boat , measured in length
  • Your boat’s speed
  • Where you are boating (inland, international water, etc.)
  • Whether you are at anchor.

Remember that your navigation lights must be visible and easily identifiable as such. Other lights on your boat cannot be mistaken for navigation lights, or get in the way of your navigation lights

Sailboat navigation lights

If you are operating a sailboat or nonpowered boat such as a canoe, kayak or rowboat, you still need to use the correct configuration of navigation lights for your boat size and boating circumstances. For comprehensive detailed instructions on navigation lights please refer to the USCG resource. The following are general guidelines:

Sailboats or vessels using paddles or oars, under 23 feet in length:

  • One white navigation light (or lantern or flashlight) that is visible from 2 nautical miles away between sunset and sunrise or during periods of low visibility. In the presence of another vessel, the light must be displayed in time to avoid a collision.

Sailboats between 23 and 65.6 feet:

  • One white stern light visible at 135 degrees and from 2 nautical miles
  • One green starboard and one red port sidelight, visible across 112.5 degrees from one nautical mile away
  • A tricolour light, which is a single all-around light which includes the three coloured of lights indicated above, facing the same directions, visible from a distance of 2 nautical miles. This type of light can only be used when under sail, and never when using a motor regardless of whether the sails are hoisted. It may not be used at the same time as regular sidelights.

Powered boat navigation lights

If you are operating a boat with an engine (including sailboats with motors), between sunset and sunrise or under conditions of restricted visibility, you need navigation lights.

Powered boats under 39.4 feet:

  • One all-around white light, visible from all directions (360 degrees) from two nautical miles away. This light must be attached at least 39 inches above the sidelights.

Recreational powered boats between 40 feet and 164 feet:

This size of boat requires two white lights which, combined, make up 360 degrees of visibility:

  • A white masthead light at the bow, visible across 225 degrees, from 2 nautical  miles away. This light must be attached at least 8 feet above the gunnel.
  • A white stern light at the stern, visible across 135 degrees and from 2 nautical miles away.

In addition to:

  • One green starboard and one red port sidelight, visible across 112.5 degrees from one nautical mile away.

Boat navigation lights at anchor

When your boat is anchored at a dock, it is not necessary to turn on your navigation lights. However, if you are at anchor in an undesignated area, you need to make other boats aware that you are not moving by displaying an all-around white light where it will be easily visible to any other boats in the area.

Diving lights

If you are boating in a resort area or anywhere there are sunken wrecks or coral reefs, keep in mind that there could be diving activity. Keep your distance and stay alert to the possible presence of divers underwater.

Boats that are accompanying divers must display:

  • Three vertical masthead lights in a red-white sequence.

Interpreting boat navigation lights

Installing and using the right navigation lights on your boat is very important, but to navigate safely, you also need to be able to interpret the navigation lights on other boats.

Remember, you may not always be boating under ideal circumstances. Make sure you learn to understand navigation lights and the United States Coast Guard rules of navigation , also called the Rules of the Road , thoroughly, so that you can make good decisions quickly, as needed.

Do you see a green light over a white light? This indicates a fishing vessel that is actively trawling. It may be necessary to avoid not only the boat, but also a large net.

Do you see a red light to the left, with two white lights to the right? Understand that you must yield to the other boat.

There are many other configurations you need to be familiar with to operate your boat safely.

Avoiding collisions

Remember, navigation lights are only a tool. You must also maintain a proper look-out at all times, by sight and hearing, to responsibly avoid collisions. Skippers must drive at an appropriate speed so that you can take effective action to avoid colliding with another vessel or body under or on the water.

Factors like visibility, traffic density, the maneuverability of your vessel, the presence of other lights from shore or scattered boat lights, the state of the sea and the draft in relation to the available depth of water must always be taken into consideration. Radar equipment may also pose certain limitations or offer certain benefits to navigating safely.

It is the boat operator’s responsibility to do everything in their power to avoid a collision, including but not limited to the correct display of navigation lights.

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Driving a boat safely demands a thorough knowledge of navigation, safety procedures and other technical details.

What you need to know depends in part on where you intend to go boating, the size and type of boat you will use, and what type of activity you will be engaged in, but there are many basic rules and regulations that you are legally obliged to follow no matter what the circumstances.

You can get your official state-approved online boating license today! Sign up for our fun and engaging boating safety course to get started.

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USCG Navigation Lights Requirements

  • By Boating Staff
  • Updated: November 2, 2017

USCG Lights

Powerboats under 12 meters (39.4 feet) in length must have separate or combined red and green sidelights covering 112.5 degrees and visible for 1 nautical mile. The white masthead light must cover 225 degrees, be 1 meter above the sidelights and be visible for 2 nautical miles. The white stern light must cover 135 degrees and be visible for 2 nautical miles, or you can substitute one 360-degree all-around white light. For larger boats, the sidelights must be visible for 2 nautical miles and the masthead light for 3 nautical miles.

Click here for complete USCG Recreational Boating Regulations.

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Boat Navigation Light Rules

Does your boat meet the boat navigation light rules? Check in here to learn all about those green and red boat lights.

boatlights

Basic boat navigation light rules are set by the U.S. Coast Guard, and may be augmented by state or local requirements as well. You can look at all of the USCG navigational rules , but we can set out the basics regarding what lights are required on a boat here:

  • All boats under seven meters which cannot exceed seven knots – Sail and power boats of this size can display an all-around white light, and may display green and red side lights as well.
  • Powerboats under 12 meters – Must show an all-around white light visible from 360 degrees (generally called a masthead light) and red and green side lights visible at 112.5 degrees placed above the hull and at least one meter below the masthead light. Or, they may have a masthead light visible at 225 degrees plus a stern light visible at 135 degrees. Side lights must be visible from one nautical mile, and masthead and stern lights must be visible from two nautical miles.
  • Sailboats under 12 meters – Must show green and red side lights (meeting the same requirements as those found on a powerboat) and a white stern light, or, may show a tri-colored masthead light.
  • Powerboats up to 20 meters – Side lights, masthead, and stern lights are all required as listed above; side and stern lights must be visible to two nautical miles and masthead lights to three nautical miles.
  • Sailboats up to 20 meter – Must show side lights and a white stern light or tricolored masthead light as listed above; all must be visible to two nautical miles.
  • All boats over 20 meters – Must show lights as listed above but masthead lights must be visible at five nautical miles.
  • All boats at anchor – An all-around white light visible for at least two nautical miles must be displayed.  

Now that you know what lights need to be on a boat in reduced visibility, it’s important to remember a few other key points that people sometimes forget.

  • First off, note that if a sailboat is operating with an engine running, it’s considered a powerboat under the rules and must be lighted accordingly.
  • Secondly, remember that it’s your personal responsibility to make sure these lights are operational. Just having them aboard isn’t enough so before every trip, it’s a good idea to flip the switches and verify that everything is working properly.
  • Third, if your boat has docking lights leave them off while operating in open waters. Boats don’t have headlights and those with forward-facing white beams are intended to be illuminated while docking, only.
  • Finally, check your state and locality rules and make sure you meet these as well, because in some areas there may be additional requirements. 

Where to Put Navigation Lights on a Boat

Most of the time, deciding where to put navigation lights on a boat has already been done for you. Modern boats will leave the factory with proper lighting already installed and you won’t have to worry about it. If you have to replace any lights, the safest move is to simply mimic the original placement and type.

When it comes to small craft, however, like jon boats  or dinghies , the boat may not come equipped with any lights at all. In fact, they may not have the electrical systems and switch panels necessary to run lights, should you want to add them. In this case you’ll want to get portable lights.

Portable navigation lights which are battery-powered may be attached to the boat with clamps, suction cups, or bases that fit into fishing rod holders. These work just fine, as long as you make sure the batteries are fresh and carry a spare set. To some degree, where you put them may depend on the boat itself and what mounting options are available. That said, if you use portable green and red boat lights, they should be placed facing forward at the bow of the boat as close to the centerline as possible. White all-around lights should be at or near the stern if practical, but in this case the most important thing is to make sure they’re clearly visible. A light on a short pole can easily be blocked from view by a person or obstruction, so it needs to be elevated higher than anything and anyone on the boat.

Following the boat navigation light rules and requirements isn’t just necessary under the law, it’s also an important aspect of safe boating. We all want to make sure our days — and nights — spent aboard a boat are as safe as possible, so be sure your boat’s navigation lights are up to snuff.

To make sure you’re up to date on all aspects of boating safety, be sure to check out our Boating Safety Guide .

Read Next: Boat Safety Checklist & Safety Equipment

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Boat navigation lights rules and requirements at night Requirements in Canada

  • Boating Safety Equipment
  • Types of navigation lights
  • Boat Navigation Lights rules and requirements at night

Powerboats navigation lights at night

navigation lights

  • Powerboats less than 12 meters (39,4") in length
  • Powerboats of 12 meters (39,4") and over in length
  • Powerboats at anchor

Properly lit sailboat at night

properly lit sailboat at night

  • Sailboats under 7 m (23’)
  • Sailboats from 7 m (23’) to under 20 m (65’7”)
  • Sailboats 20 m (65’7”) and over
  • Sailboats operating under motor power
  • Sailboats at anchor

Commercial boats navigation lights at night

navigation lights fishing boat

  • Navigation lights for a vessel engaged in fishing  

Navigation lights for a vessel engaged in trawling

Navigation lights for a power-driven vessel when towing.

  • Navigation lights for a government vessel

Navigation lights for powerboats less than 12 meters (39,4") in length

A power driven vessel of less than 12 meters in length, and underway, may display, from sunset to sunrise:

All-round light (white) forward and,

Sidelights (red – green).

Navigation lights for boats

Navigation lights for powerboats of 12 meters (39,4") and over in length

A power driven vessel of 12 meters and over in length, and underway, may display, from sunset to sunrise:

Masthead light (white) forward,

Sternlight (white) and,

Navigation lights for powerboats of 12 meters (39,4

Navigation lights for powerboats at anchor

At anchor,  the operator of a pleasure craft shall display, from sunset to sunrise, in the fore part,  an all-round light .  A powerboat anchored at night must display  an all-round light .

Navigation lights for powerboats at anchor

What is a properly lit sailboat at night?

Navigation lights for sailboats under 7 m (23’).

and underway, may display, from sunset to sunrise:

Sidelights (red – green) and,

Sternlight (white).

  • 1 lantern, combining the sidelights and stern light above.

Navigation lights for sailboats under 7 m (23’)

Navigation lights for sailboats from 7 m (23’) to under 20 m (65’7”)

  • Sternlight , and
  • 1 lantern, combining the sidelights and stern light above

Navigation lights for sailboats from 7 m (23’) to under 20 m (65’7”)

Optional - A sailing vessel may exhibit at or near the top of the mast, two all-round lights in a vertical line: the upper one red and the lower one green. These lights are shown along with the sidelights and sternlight.

Navigation lights for sailboats 20 m (65’7”) and over

Navigation lights for sailboats 20 m (65’7”) and over

Navigation lights for sailboats operating under motor power

Sailboats are considered powerboats when they have the engines on - even if the sails are up. 

Masthead light  (white) forward,

Sternlight  (white).

Navigation lights for sailboats at anchor

Navigation lights for sailboats operating under motor power

Navigation lights for kayak or canoe (human-powered vessels) at night

Navigation lights are also required for  human-powered vessels (canoe, kayak)  or for a sailing pleasure craft of less than 7 meters in length not under power. When underway,  the operator  shall, from sunset to sunrise, display, if practical, sidelights and a stern light, but if the operator cannot, he/she must have at hand , a   flashlight   or lighted lantern emitting a white light which must be lit in enough time to prevent a collision.

Navigation lights for kayak or canoe (human-powered vessels)

Navigation lights for a vessel engaged in fishing 

Sidelights ,

Sternlight and

All-around light in a vertical line, the upper being red over white light. When making way through the water.

Navigation lights for ships engaged in fishing 

A  vessel when engaged in trawling , which means dragging a dredge net or other fishing apparatus through the water, shall display:

Two all-round lights in a vertical line, the upper being green and the lower white. When making way through the water,

Sidelights and 

Sternlight.

Navigation lights for a vessel engaged in trawling

Navigation lights for a government vessel (Police boat)

Any government vessel or any vessel that is owned or operated by a harbor, river, county or municipal police force may display a blue flashing light to identify itself as such, in the following cases

When it is providing assistance in any waters to any vessel or other craft;

When it is engaged in law enforcement duties in Canadian waters.

navigation-lights-police-iso-hr

Power-driven vessel when towing shall show sidelights, a sternlight, and a towing light in a vertical line above the sternlight, and two masthead lights in a vertical line. When the length of the tow, measuring from the stern of the towing vessel to the after end of the tow exceeds 200 meters, three such lights in a vertical line shall be displayed.

Apart from the regular navigation lights, when a boat tows another vessel in distress or in need of assistance for any reason, shall take all possible measures to show the relation between the towed vessel and the vessel doing the towing. A vessel towing must try to shine a light on the towing cable to make it as visible as possible, so that other boats do not come into contact with the cable.

A vessel being tow shall display sidelights and a sternlight. If it is not possible, it must display one all-around white light at each of the fore and aft ends.  

Navigation lights for a power-driven vessel pushing another

A power-driven vessel, when pushing another , shall display the sidelights, a sternlight, and two superimposed masthead lights. 

The vessel being pushed, and not part of a composite unit, must display its sidelights at the bow. When a vessel is pushing another, if both are connected in a rigid, composite unit, they will be regarded as one unit, thus showing the appropriate lights.

Navigation lights Examples

Sailing vessel seen from starboard side.

Sailing vessel seen from starboard side

Sailing vessel seen from the front

Sailing vessel seen from the front

Power-driven vessel anchored

Power-driven vessel anchored

Power-driven vessel seen from starboard side

Power-driven vessel seen from starboard side

Power-driven vessel seen from port side

Power-driven vessel seen from port side

Power-driven vessel seen from the stern (back)

Power-driven vessel seen from the stern (back)

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sailboat night light requirements

What Lights Are Required on a Boat at Night? A Guide to Navigation Lights

Boating at night can be a thrilling experience, but it can also be dangerous if proper precautions are not taken. One of the most important safety measures boaters need to be aware of is the use of navigation lights. Navigation lights are required on all boats when operating between sunset and sunrise, or in conditions of reduced visibility.

Table of Contents

Understanding Boat Navigation Lights

Boat navigation lights are an essential part of boating safety, especially when sailing at night or in low visibility conditions. These lights serve as a communication tool between boats, indicating their position, direction, and status.

To understand boat navigation lights, it’s important to know the different types of lights and their meanings. The following table summarizes the different types of lights and their characteristics:

The masthead light is a white light that is placed centerline on the boat, showing an arc of 225 degrees with 112.5 degrees on either side of the front of the vessel. This light indicates the presence of a boat and its direction of travel.

Sidelights are a pair of lights, with one red light on the port side and one green light on the starboard side. These lights must show an arc of 112.5 degrees from the centerline of the bow. The sidelights indicate the direction of travel of the boat and help other boats determine the boat’s orientation.

The stern light is a white light that is placed at the aft end of the boat, showing an arc of 135 degrees. This light indicates the presence of a boat and its direction of travel.

Boats under 12 meters in length may combine the sidelights and stern light into one fixture, while boats under 7 meters may use a handheld light instead of the required lights.

It’s important to note that navigation lights must be visible at a sufficient distance to prevent collisions. The exact visibility requirements depend on the size and type of the boat.

Types of Navigation Lights

When operating a boat at night, it is essential to have the right navigation lights to ensure safety and avoid collisions. Navigation lights are classified into four types: stern lights, bow lights, masthead lights, and all-round lights.

Stern Lights

Stern lights are white lights located at the back of the boat. They are essential for indicating the position of a vessel to other boats approaching from behind. The stern light should be visible from at least two miles away and should be placed at a height that ensures it is visible from all directions.

Bow lights are red and green lights located at the front of the boat. The red light should be on the port (left) side of the boat, while the green light should be on the starboard (right) side. These lights help other boats determine the direction of the vessel and prevent collisions.

Masthead Lights

Masthead lights are white lights located at the top of the mast. They are visible from all directions and help other vessels determine the size and type of the boat. Masthead lights should be visible from at least two miles away and should be placed at least 1 meter above the sidelights.

All-Round Lights

All-round lights are white lights that can be seen from all directions. They are used to indicate the position of a vessel when it is not under command or when it is anchored. All-round lights can be mounted on a mast or on the top of the cabin.

Legal Requirements for Boat Lights

Boat lights are required by law to ensure the safety of all watercraft and passengers. The legal requirements for boat lights are set by the Collision Regulations, which specify the types, colors, and locations of lights that must be displayed on boats of different sizes and types.

For example, power-driven boats under 39.4 inches in length must display navigation lights from sunset to sunrise. These lights must include side lights, a masthead light, and a stern light. Sailboats operating under engine power are also considered power-driven and must follow the same rules.

Boats over 39.4 inches in length must display additional lights, such as a towing light or an all-around white light. The exact requirements vary depending on the size and type of boat, as well as the operating conditions.

The table below summarizes the legal requirements for navigation lights on boats in the United States:

It is important to note that these are minimum requirements, and boaters are encouraged to go above and beyond to ensure their safety and the safety of others on the water. This might include using additional lights or reflectors, or taking other precautions such as reducing speed or avoiding crowded areas.

In addition to the legal requirements for boat lights, boaters should also be aware of the rules of the road for navigating on the water. This includes understanding the right of way, signaling intentions, and communicating with other boats using lights, horns, or other means. By following these rules and regulations, boaters can help ensure a safe and enjoyable experience on the water.

How to Use Navigation Lights Properly

Navigation lights are an essential tool for keeping boaters safe at night or in times of reduced visibility. Proper use of these lights is crucial to prevent collisions and ensure safe passage. Here are some tips on how to use navigation lights properly:

  • Always make sure that your navigation lights are in good working condition and turned on when required.
  • Know the required lights for your vessel size and type, as well as the rules for displaying them. Refer to the relevant regulations for your area.
  • Display the correct lights for your vessel’s activity. For example, if you are anchored, you should display an anchor light.
  • Make sure that your lights are visible to other vessels. Keep them unobstructed and at the proper height and angle.
  • Use your navigation lights in combination with other safety measures, such as radar and AIS, to increase your visibility and awareness of other vessels.
  • Avoid shining bright lights, such as spotlights, in the direction of other vessels as it can impair their vision and cause confusion.
  • Take extra care when navigating in areas with heavy traffic or poor visibility. Slow down and keep a lookout for other vessels.

Common Mistakes and How to Avoid Them

When it comes to navigation lights on a boat, there are a few common mistakes that boaters make. Here are some tips on how to avoid them:

1. Failing to Turn on Navigation Lights

One of the most common mistakes boaters make is failing to turn on their navigation lights. Navigation lights are required from sunset to sunrise and during periods of reduced visibility. It is important to turn them on as soon as visibility becomes poor or when the sun sets.

2. Using Incorrect Navigation Lights

Another mistake that boaters make is using incorrect navigation lights. Each boat has specific requirements for navigation lights based on its size and type. It is important to know the legal requirements for your boat and to ensure that you have the correct lights installed.

3. Improper Placement of Navigation Lights

Navigation lights should be placed in the correct location on the boat. For example, the masthead light should be placed centerline on the boat showing an arc of 225 degrees with 112.5 degrees either side of the front of the vessel. Sidelights should be placed on the port and starboard sides of the boat and must show an arc of 112.5 degrees from centerline of the bow.

4. Not Checking Navigation Lights Regularly

Navigation lights should be checked regularly to ensure that they are working properly. It is important to check them before every trip to make sure that they are functioning correctly. If a light is not working, it should be replaced immediately.

5. Not Having Backup Navigation Lights

Finally, it is important to have backup navigation lights on board in case the primary lights fail or become damaged. Flashlights can be used as backup lights in case the navigation lights burn out or become damaged.

By avoiding these common mistakes, boaters can ensure that their navigation lights are functioning properly and that they are following the legal requirements for their boat.

Maintaining Your Boat’s Navigation Lights

Proper maintenance of a boat’s navigation lights is crucial for ensuring the safety of the vessel and its passengers. Here are a few tips to help keep your navigation lights in good working condition:

  • Regularly inspect the lights for any damage or wear and tear. Replace any broken or damaged lights immediately.
  • Check the wiring and connections regularly to ensure they are secure and free of corrosion. Corroded connections can cause the lights to malfunction or fail altogether.
  • Clean the lenses of the lights regularly to ensure maximum visibility. Dirt or grime on the lenses can obscure the light and reduce its effectiveness.
  • Test the lights before each trip to ensure they are working properly. This includes checking the brightness, color, and direction of the light.
  • Replace the bulbs as needed. It is recommended to carry spare bulbs on board in case of a bulb failure.

In conclusion, navigation lights are an essential safety feature for any boat that operates at night or in reduced visibility conditions. They help to ensure that other boats can see and avoid collisions with your vessel.

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Inspect Your Boat's Navigation Lights

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Navigation light inspections are a critical part of boat ownership. Don't take your red and green safety gear for granted.

Nav lights

I've never understood why so many vessels I inspect as a marine surveyor fail in their ability to comply with mandated navigational lighting requirements. I'd estimate the percentage is as high as 30% (or worse), an appalling rate when it comes to safety-related equipment. Imagine if your life jackets or fire extinguishers only worked 70% of the time when needed.

Most problems I see are maintenance issues (cloudy lenses, burned-out bulbs, broken wires), but an alarming number are improper initial installations by the manufacturer or blockage from aftermarket equipment installations by owners or dealers. It appears many either do not have a good understanding of the navigation rules governing installations or they shoot for (and miss) the bare minimum requirements, often at the expense of the end user.

Regardless of what the manufacturer did (or didn't) do, it's imperative to remember that when it comes to navigational lighting, it is your responsibility to ensure your boat complies with the rules. Here's how to make sure your boat is ready for the nightlife.

General Requirements

It's beyond the scope of this article to list every possible configuration or variation of lights, however, by way of example, a typical powerboat less than 65 feet while underway at night or in reduced visibility would require side lights, a masthead light, and a stern light. The side lights consist of a green light to starboard and a red light to port, both of which must cover an arc of the horizon (or sector) of 112.5 degrees visible from dead ahead to 112.5 degrees down each respective side.

The masthead light is a forward-facing white light on the vessel's fore and aft centerline showing an unbroken arc of 225 degrees and fixed to show the light from dead ahead to 22.5 degrees abaft the beam on either side of the vessel. The stern light, also a white light, must be visible from dead astern for an arc of 135 degrees (67.5 degrees on either side of centerline). You'll notice that adding the arc of visibility of the masthead and stern light yields 360 degrees, which is what they're shooting for coverage-wise. Vessels less than 39.4 feet in length have the option of exhibiting a single 360-degree white light in lieu of a separate masthead and stern light. (As a practical matter, you should be sure that the optional single 360-degree light will not interfere with your night vision.) Vessels anchored at night or in reduced visibility are required to display a single all around white light visible for 360 degrees.

Anchored light fixture using visegrips

This anchor light is being held in place with vice grips.

Blocked bow light

The stanchion on this poorly designed bow pulpit runs down the center of the navigation light from the front.

Blocked side light

Another poorly placed stanchion reduces the degree of visibility of this side light.

Blocked stern light

Leaving the canvas down has blocked this stern light.

All boats must have the ability to display required navigation lights while operating at night and during times of reduced or restricted visibility (such as fog or heavy rain). Required navigation light configurations are based on a number of factors, such as a vessel's length, method of propulsion, or any special activity it's engaged in (e.g., trawling, towing). The type, arc, and color of navigation lights allow observers to determine a vessel's size, propulsion, and whether it's anchored or moving (and if so, its course).

For example, if you look over your bow and see a red light followed by a white light, you can assume a vessel is crossing your path from starboard to port and (depending on distance) it is the stand-on vessel (meaning it has the right of way) and you would be the give-way vessel. A single white light visible 360 degrees, on the other hand, indicates an anchored vessel or possibly a vessel that is aground.

The first step in determining if your vessel is compliant is to consult a copy of U.S. Coast Guard COMDTINST M16672.2D , aka the "Rules of the Road."

Bow light tape repair

Using tape to hold this bow light in place has reduced the visibility by half.

Damaged anchor light

This damaged anchor light is not going to be very visible to other vessels.

Old and UV-damaged combination bow light

This old bow light has "fogged" from age and exposure to UV light, which will reduce brightness and visibility.

Old and UV-damaged stern light

This old stern light has "fogged" from age and exposure to UV light, reducing the brightness and visibility.

Inspections

Once you've consulted the Rules of the Road and determined your navigation lights meet the requirements, next up is a physical inspection to make sure they're installed and operating properly. Start by turning on your running lights and then your anchor light, verifying in turn that each powers up and meets the visibility requirements mentioned in the Rules of the Road.

Look for issues such as the placement of equipment (e.g., dinghies, fenders, canvas) that could block visibility, burned-out bulbs, and poor lighting installations.

A good example of the latter is a masthead light that effectively blinds you when operating the vessel from the upper helm or fly bridge. Assume nothing and keep your eyes open for the unexpected, such as side light lenses (red port, green starboard) being reversed, a problem I've seen where lights have been replaced by well-meaning owners.

Sailboat owners may find it easier to verify the operation of mast-mounted navigation and anchor lights at night from the dock when they're more easily visible.

Next, take a good look at the lights themselves. Are they damaged? Are they burning brightly or dim, a problem that can be caused by UV damage or "frosting" of the lens, installation of the wrong type of bulb, or a poor quality light. Dirty lenses or corroded electrical contacts and switches can also cause problems.

Installing LED Boat Navigation Lights

Distance visibility (how far your navigational lights can be seen) is crucial and can easily be a case where meeting the letter of the law doesn't necessarily mean the spirit of the law has been satisfied. I've seen installations designed to meet the minimal requirements under perfect conditions (clear weather, minimal wave action) but fail miserably in less-than-ideal conditions, the very times you want to make sure you're seen. Problems range from poor location of the navigation lights (flush mounted sidelights in the hull below the rubrail are a good example of this) to the lights themselves, which are often too small or simply pieces of junk to begin with.

Don't be afraid to relocate factory-installed navigation lights to better comply with the requirements or replace them with brighter, more robust units. (If there is any question as to rule compliance or appropriateness of the lights, have an ABYC-qualified surveyor or other qualified person check them.) LED fixtures have become a popular choice, and the benefits are numerous — longer life (up to 100,000 hours in some cases), less power draw, sealed construction (eliminating corrosion), and not susceptible to damage from shock or vibration.

Do not, however, simply swap your incandescent navigation light bulbs with LED replacements. Navigation light fixtures are approved for use as a unit (i.e., bulb and fixture together), and simply swapping out the bulb of your current fixture does not mean the new combination will comply. Once you've verified everything is in good working order, record the types of bulbs required for all non-LED navigation lights and ensure you've got plenty of spares onboard.

Boat owners love lots of pretty lights, but you have to ensure that decorative light installations cannot be mistaken for navigation or law enforcement lights and that they don't impair the visibility or distinctive character of approved and properly placed navigation lights. You also don't want them to interfere with your ability to maintain a proper lookout. Haphazard installation of additional lighting must be avoided, and violations (resulting in fines or worse) can occur if those mood lights installed on your rig can be construed as a light required by the Rules for another vessel. For example, blue underwater LED lights can appear to be flashing if wave action is present, giving the appearance of a flashing blue light that only law enforcement vessels are authorized to use.

Finally, include checking the operation of all navigation lights as part of your predeparture checklist. It only takes a moment and you'll be doing yourself (and everyone else on the water) a favor.

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Frank Lanier

Contributing Editor, BoatUS Magazine

Capt. Frank Lanier is a SAMS Accredited Marine Surveyor with more than 40 years of experience in the marine and diving industries. He’s also an author, public speaker, and multiple award-winning journalist whose articles on boat maintenance, repair, and seamanship appear regularly in numerous marine publications worldwide. He can be reached via his YouTube channel “Everything Boats with Capt. Frank Lanier” and website captfklanier.com.

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Navigation Lights on Sailing Yachts and Motor Boats

Navigation Lights on Sailing Yachts and Motor Boats

Navigation lights ensure the safety of everyone at sea. The Convention on the International Regulations for Preventing Collisions at Sea (IMO COLREG 72) precisely sets out the guidelines for navigation lights, i.e., displaying lights, their range (distance from which the light is visible), as well as how they should be constructed and assembled. Our guide is of interest to sailors and sports boats enthusiasts with boats up to 20 m in length.

Regulations and official certifications:

When must navigation lights be displayed, what are the regulations concerning the use of navigation lights at sea, how do i know that my lights are eu-compliant, what is a ce mark, how are navigation lights defined, minimum range of navigation lights:.

  • From what distance must lights be visible?
  • What lights are required for my boat?

What lights must be displayed on a sailboat or rowing boat with a motor?

What lights should i exhibit when at anchor, what lights should be displayed to show that a vessel is unable to manoeuvre.

  • How do I indicate that my vessel has run aground?

Navigation lights – Conventional and LED:

What distinguishes led from conventional navigation lights.

  • Replacement bulbs for conventional & LED lights

What are the advantages of LED navigation lights?

Switching from conventional to led navigation lights.

According to COLREGs part C, rule 20), navigation lights must always be used on board from sunset to sunrise or during the day if visibility is poor.

Please refer to the German Traffic Regulations for Navigable Maritime Waterways , §8 -10 and Preventing Collisions at Sea. Part C - Lights and Shapes. rules 20 - 31, and annexes I 1. - 14 for the exact wording.

NOTE: Vessels that are authorised to fly the German flag are generally only permitted to use approved navigation lights and sound signalling devices.

EU approval can be identified via the wheel mark symbol and the notified body number. BSH approved navigation lights (previously DHI) are marked with a model number (e.g., BSH/00/01/90).

However, even older lights with DHI approval that have already been installed maintain their approval, despite the changes made by the BSH.

In addition to the wheel mark symbol and German BSH approval, some lights are also approved by other countries, such as RINA (Registro Italiano Navale), MCA (Maritime and Coastguard Agency) and the USCG (United States Coast Guard). These are now recognised, provided the approval comes from the national approval body recognised in the country of origin.

National bodies whose accreditation is currently recognised in Germany:

The wheel mark symbol indicates approval of the Marine Equipment Directive (MED). This approval is valid for all EU member states, both for commercial vessels and recreational shipping.

0098 = Notified Body number (here 0098 = Germanischer Lloyd in Hamburg) 18 = year in which the mark is affixed, here 2018

Basisschicht

  • A CE mark is a symbol that must be affixed to a product by the manufacturer before it is sold on the European market. It indicates that the manufacturer is aware of the specific requirements for the product in question and that it fulfils the requirements of relevant European product directives. A CE mark does not supersede approval according to collision prevention regulations.
  • Navigation lights are defined in detail by the International Maritime Organization (IMO), according to the International Regulations for Preventing Collisions at Sea, 1972 (COLREGs) Convention on the International Regulations for Preventing Collisions at Sea, 1972), in sections C and D. The following rules apply:

Which navigation lights are required on board according to IMO COL REG?

Definitions according to the 1972 International Regulations for Prevention of Collisions at Sea (COL REG 72):

Side lights

1. Side lights for starboard and port

A green light on the starboard side and a red light on the port side, which shine from dead ahead in an arc of 112.5° aft to a point 22.5° abaft the beam (behind the beam) on either side of the vessel. On ships of less than 20 metres in length, the two individual sidelights may be replaced by a dual-colour combined light. This must be centrally located on the bow and stern axis.

Stern light

2. Stern light

A white light mounted as close to the stern as possible and shines dead ahead in an arc of 135° (67.5° to each side). The mounting height should be aligned to the height of the side lights and should never be higher.

Three-colour light for sailing vessels (sailing lights)

3. Three-colour light for sailing vessels (sailing lights)

On sail boats up to a length of 20 m, the side light and stern light can be combined into one three-colour light mounted on top of the mast. However, as soon as the sail boat's motor is engaged, the use of a three-colour light is no longer permitted. The rules for motor-powered vessels then apply.

Mast-head light

4. Mast-head light

A white light placed over the centre line of the vessel and shines dead ahead in an arc of 225° (from straight ahead up to 22.5° more aft than crosswise to each side). The mounting height should be at least 1 m higher than the side lights. In the past, the mast-head light was also referred to as a steam boat light or steamer light, as it is only seen on ships that operate under engine power.

Signal light or all-round light

5. Signal light or all-round light

A light that shines in a complete circle of 360°. It may emit white, red or green light, depending on use. Examples of use: All sailboats and motorboats at anchor must exhibit a white anchor light . Ships over 12m in length must, if necessary, display vessel-in-distress lights (two red signal lights) placed at a vertical distance of at least 12 m. The distance between such lights must not exceed 1 m.

From what distance must navigation lights be visible?

The range indicates the distance from which the light can be seen. The minimum ranges of navigation lights are defined according to ship size as follows::

Best-seller Hella marine

Image of NaviLED Port Navigation Light, white

Note: When sailing boats are powered by a motor, the rules for motorboats apply and not for sailboats. The tricolour light may then no longer be displayed.

Displaying lights for sailboats up to 20 m

Displaying lights for sailboats up to 20 m

1 x red port side light

1 x green starboard light

1 x stern light

Also allowed:

1 x red all-round light on or near the mast top

1 x green all-round light on or near the mast top

Displaying lights for sailboats up to 20 m

1 x 3-colour light

Sailing vessels under 7 m (dinghies or small sports boats)

Sailing vessels under 7 m (dinghies or small sports boats)

If, due to their design, no modern lights can be fitted, sailing vessels under 7 m in length and vessels being rowed must always carry an electric torch or lantern showing a white light, ready to exhibit in sufficient time to prevent a collision.

1 x Electric light or a torch with white light

Motorised vessels over 12 m

Motorised vessels over 12 m

Lights used must be either / or:

1 x white masthead light fore

Motorised vessels over 12 m

1 x dual colour light

Motorised vessels under 12 m

Motorised vessels under 12 m

Alternatively, motorised vessels under 12 m can exhibit the following lights:

1 x white all-round light

Motorised vessels under 12 m

Motorised vessels under 7 m and 7 knots maximum speed (small motor boats, dinghies or inflatables):

Motorised vehicles under 7 metres and with a maximum speed of no more than 7 knots can display the following navigation lights: all-round lights, portside and starboard lights.

The following applies in accordance with German Traffic Regulations for Navigable Maritime Waterways (SeeSchStrO): If, due to their design, no lights can be displayed (e.g., dinghies), sailing vessels under 7 m in length and 7 knots maximum speed must carry an electric hand-held spotlight or a torch to prevent collisions in the dark.

Left: 1 x white all-round light, 1 x red port side light, 1 x green starboard light

Right: 1 x hand-held spotlight or torch

Best-seller Aqua Signal Conventional

Image of Series 41 Bicolour Light, black housing

Best-seller Aqua Signal LED

Image of Series 34 LED Tricolour / Anchor Light / black housing

Provided no engine power is used, the rules for sailboats apply. Motor-sailing vessels must display a large black cone pointing downwards when sailing during the day or at good light.

For vessels travelling under sail or at rudder during darkness or at reduced visibility, the rules for carrying lights for motorised boats automatically apply. This then depends on the length of the boat.

By day with a black cone, tip pointing downwards.

Visual signalling equipment

Image of Motoring Cone

Torches & Spotlights

Image of Portable Halogen Search Light / 12 V

How must navigation lights be mounted on board?

Navigation lights must be securely mounted perpendicular to the waterline. Mast-head lights and stern lights should both be placed above the keel line.

At anchor during daylight? This must be displayed with a black anchor ball.

If the vessel is anchored outside of an area of water known by the River and Shipping Police Authority as an anchorage and berth for small vessels, this must be indicated as follows:

A black ball by day, 1 x white all-round light at night

Vessels at anchor

Marker Lights

Image of Universal Bulb / Anchoring Light 12 V

If your boat is unable to manoeuvre*, this should be indicated as follows:

Stationary: 2 x red all-round light, 2 x black ball, one below the other (during the day)

Moving: 1 x red port side light, 1 x green starboard light, 1 x white stern light

* A vessel is described as if, due to exceptional circumstances (e.g., rudder failure or engine malfunction), it cannot manoeuvre as prescribed and therefore cannot avoid another vessel.

Vessels that have run aground

How do I indicate correctly that my sailboat or motorboat has run aground?

If your boat has run aground, this should be indicated as follows:

2 x red all-round light, 1 x white all-round light, 3 x black ball, one below the other (during the day)

Manufacturers that specialise in navigation lights such as Aqua Signal or Hella Marine supply a wide range of internationally approved navigation lights which work with conventional (with BSH bulb) or with permanently installed light-emitting semiconductor components (LEDs). The bulbs required for operation are an integral part of the approval. Replacement bulbs must also be certified so that approval / your insurance protection is guaranteed. Ships under 20 m: Stern and anchor lights require BSH-approved light bulbs with 10 watts, all other navigation lights 25 watts.

All series listed above with BAY15d sockets could alternatively be operated with a high-Power LED . The big advantage in doing so is that the LED is suitable for multiple voltages (10-30 V) and consumes just 3 watts during operation. Since the light colour, range of light or beam angle can vary depending on the housing, this light is NOT yet internationally approved.

Spare Bulbs - Conventional & LED

Image of Spare Bulb for Navigation Lights / 12 V / 10 W

Energy consumption on sailing ships is, as ever, a topic of significant interest. This is especially true for blue-water sailors who like to sail longer distances at a stretch. The arguments for converting to LED technology are as follows:

  • High energy savings due to the low power consumption
  • Long lifespan (over 10,000 hours)
  • MultivoltTM technology (10-30V) with greater tolerance to voltage peaks
  • Compact and light housing constructions
  • Waterproofed, hermetically sealed housings
  • Maintenance free

When switching completely from conventional navigation lights to LED lights, lights with the BSH seal of approval / EU wheel mark meet all the requirements in terms of light colour (no risk of blue tint), range of light and beam angle, and that you are travelling in accordance with KVR.

Navigation lights with LED technology

Image of NaviLED PRO Starboard Light / black / with BSH/Wheelmark-certification

Replacing your navigation lights is often easy to do as manufacturers usually use the same mounting points for LED lights or have an adapter plate for further use of existing drill holes:

adapter plate

Adapter plate

Image of Cover Plate for Mounting on Series 40 / 43 / 50 Brackets

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Written by our SVB (technical) experts

Written by our SVB (technical) experts

Our SVB safety experts regularly carry out maintenance checks and tests on our safety products, such as life jackets, life rafts etc. They test products and base their recommendations on many years of experience and their own know-how.

sailboat night light requirements

Boat Navigation Light Rules Explained (For Beginners)

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Boat navigation light rules can be a little difficult for newcomers to understand.  This is probably because these light rules can change depending on a wide variety of factors.

Failing to comply with these rules can leave you open to enforcement violations as well as lawsuits. 

Also, knowing these rules will help keep you and other boaters safe while out on the water, so you must learn and remember them.

Here’s everything you should know about the boat navigation light rules.

Table of Contents

sailboat night light requirements

Why Have Boat Navigation Light Rules At All

Boat navigation light rules help boaters communicate with each other.  They also help to determine who has the right of way.  This is important as it determines what actions boats will take as they pass one another.

Without these guidelines, there would be many more accidents out on the water as people wouldn’t know how to interact.

Remember, when you’re out on the open water, there aren’t any designated lanes to follow, and without rules, boaters can easily become confused about which way they should turn or whether or not they should even turn at all.

On top of this, these rules help establish methods for boaters to tell each other when they’re anchored or when they’re in distress.  Use your lights correctly when you need help, and you’re much more likely to get it.

When do I Need to Follow Boat Navigation Light Rules?

Light rules apply any time between sunset and sunrise.  They also apply any time visibility is low.

An example of this could be during foggy or rainy weather.

A more unusual example of this could be during a solar eclipse.  Basically, if you feel that having the lights on will help others see you better, it’s a good idea to turn them on.

The Different Light Rules by Boat and Size

Different types of boats will have different light rules that they need to follow.  These sets of rules are broken down based on whether the boat is a sailboat or a powered boat.

Once this is established, the rules are then broken down by size.

The different sizes to consider are boats shorter than 39.4 feet, boats sized between 39.4 and 65.6 feet, and boats greater than 65.6 feet.

If you’re wondering why the numbers are so precise, it’s because this is the conversion from meters.  39.4 feet equals 12 meters, and 65.6 feet equals 20 meters.

Generally, all boats will have a red light on their port side and a green light on their starboard side.  To put it in plain English, if you’re in the driver’s seat, the red light goes on the left, and the green light goes on the right.

A white light should be at the stern of the boat.  The stern is the rear of the boat.

Powered Boat Light Placement

sailboat night light requirements

Here are the lights you’ll need when operating a powered boat, depending on the size of the boat you’re operating.

  • Boats less than 12 meters or 39.4 feet long:

You’ll need one red light and one green light at the front port and starboard sides of the boat for these boats.  These lights should be positioned so that they can be seen at an angle of 112.5 degrees.  The sidelights should be strong enough to be seen from a mile away.

You’ll also need to mount them towards the bow of the boat.  This is otherwise known as the front of the boat.

Additionally, you’ll need one white light that can be seen from all angles.  It should be strong enough to be seen from two miles away. 

This light will need to be mounted at least 39 inches or 99 centimeters higher than the red and green lights.

  • Boats greater than 12 meters or 39.4 feet but less than 20 meters or 65.6 feet:

With boats of this size, you’ll still need your red and green lights, but your white lights will change.

In this case, you’ll mount a red light to your port or left side and a green light to your starboard or right side. These lights will need to be seen from an angle of 112.5 degrees, and they’ll need to be seen from a distance of one mile.

The two white lights will need to be mounted at the stern and masthead of the boat.  Stern lights can also be referred to as the aft light.  Either way, it just means the light at the back of the boat.

This light will need to be seen from a 225-degree angle facing the rear.  It needs to be strong enough to be seen from 2 miles away.

The masthead light is at the forward position of the boat.  This light is mounted on the masthead, and it must cover a 135-degree angle.

The light will need to be visible from 2 miles away.

Masthead lights must be mounted at least 8 feet above the gunnel.  The gunnel is the top edge of the side of the boat.

  • Boats larger than 20 meters or 65.6 feet long:

To operate a non-commercial boat over 20 meters or 65.6 meters long, you’ll have to have the same lights in the same positions as the smaller boats.  However, you’ll also need to add matt black inboard screens to your sidelights.

Sail Boats and Other Unpowered Boats

sailboat night light requirements

These boats can be broken down into two different size categories.

These two categories are under 23 feet or 7 meters and boats that are over 23 feet or 7 meters.

Unpowered boats such as sailboats, rowboats, and kayaks under 23 feet in length only need to have a white light on them.  This white light can be anything from a flashlight to a lantern.

However, you can still opt to place red and green lights at their appropriate places.

Larger sailboats will need to have a 135 degree white light at the stern and 112.5 degree red and green lights at the port and starboard sides.  The white light should be visible from 2 miles away, while the red and green lights should be visible from 1 mile away.

Alternatively, a tri-color light could be placed on the masthead.

This light will have all three lights built into it, and it should be visible from at least 2 miles away.

Advice For All Boats Regarding Light

Regardless of what boat size you’re on, it is a good idea to have a flashlight with you.

If your boat lights become inoperable, you’ll at least have one light that you can signal with.

Should you find yourself on the water at night in a disabled boat , your flashlight may be the only thing keeping you from being crashed into.

Light Rules For Boats at Anchor

When you’re anchored at a marina or dock, you won’t have to worry about specific boat light rules and regulations.

However, when you’re anchored out on the water, you must follow boat light rules as this will help keep other boaters from running into you.

It will also help establish that you have the right of way so you won’t have to move every time a larger boat comes your way.

Of course, having the right lights doesn’t mean you’ll be able to anchor just anywhere.  You’ll still have to follow any inland rules when it comes to anchoring your boat.

When anchored, you’ll need to display an all-around white light that lets other boaters know your position.  This light should be placed where other boaters can best see it.  For example, a sailboat might put this light at the top of its mast. Also, another all-around white light might be placed near the deck to help identify your anchored boat to nearby boats.

Boats Under Distress

Boats under distress should display what is known as a visual distress signal so that they can get help.  At night, these distress signals will come in flares, parachute flares, and lights.

You should have at least three devices on your boat to use for signaling. 

This could come in a variety of forms, and you can use the same one three times.  For example, your three devices could be having three signaling flares with you.

Only use these lights when you’re in danger.  Failure to do so can result in heavy fines and potential imprisonment.

Determining Who Has The Right of Way

When you come across another boat, and you can only see a white light, then you’ll know that you’re either approaching an anchored vessel or a vessel that is moving in front of you.  In this case, you can overtake them and go around them from either side.

If you come across a green light and a white light, then you have the right of way.  In boating terms, this means that you are the stand-on vessel.

Technically speaking, the other boat should give way, and you won’t have to worry about changing your course. 

However, there is always a chance that the other person will not give way for some reason, and you should be ready to move.  You never know, the other boater may not see you, or they may not know the rules as they should.  Remember, being right won’t mean anything if you end up dead in a boat crash.

If you come across a red and white light, you are the one that needs to give way.  In this case, you’ll want to slow your boat down and pass by them, probably behind their path.

In all of these scenarios I described, you were in a powered vessel, and you were passing a powered boat or a sailboat that was driving while under power.

However, what happens when you encounter a sailboat or other unpowered vessel in a powered vessel?

In this case, you’ll see a red light, a green light, or a white light, but you won’t see all three.  Regardless of what you see, you’ll want to give way.  This is because these boats can’t maneuver as well as you, and they probably won’t be able to get out of your way before you come across them.

At this point, you can see why different boats need different types of lights and why it’s important to use the lights that apply to your particular craft.  Use the wrong lights, and you’ll confuse the other boaters around you.  This could easily lead to an accident that could have easily been avoided.

What About Boaters Who Are Color Blind?

Unfortunately, people who are color blind won’t safely operate a boat at night by themselves.

Also, they won’t be able to get a captain’s license as you need to pass a color blind test to get this license. Here’s an article we wrote about all you need to know about boat license types (with prices) .

If you’d like to do some recreational boating at night, but you can’t differentiate between the colors red and green, you might want to consider bringing a friend along.

This way, your friend can tell you what colors you’re coming up on so that you can safely navigate yourself past other boats.

4 Types of Boat Lights

  • The red and green lights that go on the sides of a boat are known as sidelights.
  • White lights that only face backward are known as stern lights, and white lights that face forward are known as masthead lights.
  • An all-round white light is a white light that faces 360 degrees.  These lights are used on smaller boats and on boats that are at anchor.  They can be replaced by making use of a stern light and a masthead light.
  • Another type of light is the tri-color light.  A tri-color light can be used on a sailboat to portray the white, green, and red lights. Bi-color lights are also available for small powered boats and sailboats.  These lights display both red and green light.

The combination of lights that are displayed will always give the boater a 360-degree field of light.

This ensures that other boaters can see them no matter where they are in relation to each other.

Safety Precautions To Be Aware Of

Even new boats can have lights that weren’t configured correctly or lights that don’t work.

It’s important that you check these lights before you head out on the water.

This is true even if you don’t intend on staying out after dark.  After all, it’s always possible that you could become stranded until after dark or that it could become too foggy to operate out on the water without lights.

Other Things You Should Know About Boating At Night

Boat navigational light rules are critical for nighttime boating, but there are other things to consider as well.

One thing to consider when boating at night is the use of a lookout.

Having one of your passengers act as a lookout will make it more likely that you’ll spot problems in advance.

Remember, other boaters aren’t the only potential hazards you can run into at night.  Shallow shipwrecks, low water depths, and unlit piers, docks, and jetties can also become hazards if they aren’t noticed in time for you to avoid them.

High beams should be used for docking purposes only.  This is because using them while on the water can confuse other boaters.

Also, the high beams can shine into other sailor’s eyes and can give them night blindness.

Just think about it this way.

It isn’t safe to drive towards another car with your high beams on, so why would it be safe to drive towards another boat with high beams on?

Driving Speed

Nighttime boating should be done at slower speeds than day time boating.  The primary reason for this is that visibility is more limited at night.

Driving slower will help to give you more time to react to boaters and other hazards.

When you first start boating, you’ll still have to take a moment to think about the lights you see.  Driving at a slower speed will give you this additional time without affecting your safety.

Not All Lights On The Water Are Boats!

I’ll end this post with a funny story I once heard about a boat traveling at night.  This story has changed many times over the years, but the gist of it’s still the same.

It goes like this:

A large vessel was traveling at night when they came across a white light in front of them.  The ship captain immediately got on the radio and contacted the other vessel to demand that they get out of the way.

The other vessel responded by telling the captain to change his course.  To this, the captain responded with, “This is the warship, the USS Enterprise, and I demand you change course, or we’ll be forced to take action!”.

To this, the other vessel responded with, “This is a lighthouse, and you are on course to become shipwrecked.”.

This isn’t a real story, and now that you know proper boat navigation light rules, it is a story that could never happen to you. 

If you came across a white light and thought it was a boat, you’d assume it was unpowered or at anchor, and you’d take steps to go around it.

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Chapter 2: Boating Safety

Navigation light requirements.

Navigation lights are generally mandatory during times of limited visibility regardless of the type of vessel. These lights are invaluable because they allow boaters to identify the type of vessels around them, as well as their relative size. While learning the different arrangements which apply to different vessels, pay close attention to the differences between the navigation light requirements for unpowered and powered vessels.

Navigation Lights for Unpowered Vessels:

If a sailboat is over 23 feet (7 meters), the following standards must be met:

Unpowered boats of this size also have the option of using an all-around light set up, which is also referred to as a tricolor light.

Vessels over 23 feet (7 meters) but under 65.62 feet (20 meters) also have the option of using a combined red over green configuration mast light.

If a sailboat is under 23 feet (7 meters), the following standards must be met:

Navigation Lights for Powered Vessels:

If a powerboat is Greater than 39.4 feet (12 meters), but less than 65.6 feet (20 meters), the following standards must be met:

Additionally, the masthead must be placed at least 8 feet above the gunnel. Refer to Figure D as an example of the proper configuration. These rules also apply to sailboats using a motor.

If a powerboat is less than 39.4 feet (12 meters), the following standards must be met:

Similarly, powered vessels under 7 meters, with speeds under 7 knots, may feature a white all-around light that is visible from two miles away and, if possible, a pair of red and green sidelights in international waters only.

Additionally, the all-around white light must be positioned at least 39 inches above the sidelights. Refer to Figure A as an example of the proper configuration. Note that sailboat in Figure E is using a motor. Even if a sailboat is flying its sail it may still be under engine power, in which case, it is treated as a powered vessel. Therefore, it is vital to note the configuration of a vessel's navigation lights, and what they communicate about the vessel.

If a vessel is at anchor, the following standards must be met:

This covers the sizes of boats typically operated as a recreational boat. For larger vessels, refer to the U.S. Coast Guard Navigational Rules and Regulations Handbook.

Course Signup: Location

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IMAGES

  1. Properly Light Sailboat At Night

    sailboat night light requirements

  2. Boat Navigation Lights Rules: Illustrated Beginners Guide

    sailboat night light requirements

  3. Boat Navigation Lights Rules: Illustrated Beginners Guide

    sailboat night light requirements

  4. Boat Navigation Lights Rules: Illustrated Beginners Guide

    sailboat night light requirements

  5. Know Which Navigation Lights are Required for Your Boat

    sailboat night light requirements

  6. Boat Navigation Lights Rules: Illustrated Beginners Guide

    sailboat night light requirements

VIDEO

  1. Night light line freezing test- Good tools and machinery make work easy

  2. Sailboat Racing Tips: Light Wind Lake Sailing

  3. Light wind sailing in a GP14

  4. Night Sailboat Racing on the Chesapeake Bay

  5. Week 4

  6. New lights on the old wakeboat project #wakeboat #lights #boat #boatlife #boatrestoration

COMMENTS

  1. Navigation Lights : BoatUS Foundation

    On any vessel, navigation lights have a specific color, (white, red, green, yellow, blue), arc of illumination, range of visibility, and location, as required by law and regulations. For the purposes of this course, we will concentrate on pleasure boats under 65 feet in length. Knowledge of navigation lights is important to a small-boat skipper ...

  2. Boat Navigation Lights Rules: Illustrated Beginners Guide

    They must show an arc of 112.5 degrees from centerline of the bow. Stern light - A white light on the stern of the boat showing an unbroken arc of 135 degrees from centerline of the vessel. All-round light - A light showing in an unbroken arc of 360 degrees. The good news is you need not measure these angles.

  3. Know Which Navigation Lights are Required for Your Boat

    The basic rule is that sidelights and a stern light are required. Permissible variations to this rule appear below. Sailboats less than 20m (65.7') can substitute a tricolor light for separate sidelights and stern light—or a bi-color light and a stern light may be substituted. Sailboats less than 7m (23') shall, if practicable, exhibit lights ...

  4. Required Lights: Sailboats When Underway

    View Course Outline. Required Lights: Sailboats When Underway. If less than 65.6 feet long, these vessels must exhibit the lights as shown in Figure 2. The required lights are: Red and green sidelights visible from a distance of at least two miles away—or if less than 39.4 feet long, at least one mile away—on a dark, clear night.

  5. Boat Navigation Lights: Everything You NEED to Know (2024)

    Powerboat under 23 feet (7m) Powerboats under 23 feet are required to have the following navigation lights displayed: One white masthead light visible for 2 miles. One red & green sidelight visible for 1 mile. One stern light visible for 2 miles. One white, red, green, or yellow all-round light visible for 2 miles.

  6. Shining the Sailboat Lights At Night: What You Need To Know

    Don't forget to check for site-specific requirements. The lights use a color-coding system for all boats, whether motorized or non-motorized. Even watercraft like jon boats or canoes have obligations to convey their approach on the water. ... Sailboat lights at night are a crucial part of safe navigating when it's too dark to see.

  7. Navigation Lights for Sailboats (And How To Read Them)

    Knowing that the bow lights go 22.5 degrees abaft the beam on both sides or 112.5 degrees on each side, and the stern light faces 225 degrees aft for a total of 360 degrees of visibility, you can tell a lot about where a boat is heading and who has the right of way. One thing that's easy to remember is red means stop and if you see a vessel's ...

  8. Navigation Lights Requirements

    The USCG has specific navigation light requirements that all boats need to meet - often depending on the size of the vessel. Read our guide to learn more today. ... NOTE: A sailboat operating under power at night - whether the sails are set, or not - is required to follow the same rules as a power boat, as outlined above, since they are no ...

  9. Required Navigation Lights: Sailboats Under Sail

    One combination red, green, and white light exhibited near the top of the mast meets the navigation lights requirement for sailboats less than 20 metres (65.6 feet) in length and not operating under engine power (Rule 25). Official boater safety courses recognized by the U.S. Coast Guard and approved by NASBLA and your state boating license agency.

  10. Boat Navigation Light Rules, Types and Requirements

    Powered boats under 39.4 feet: One all-around white light, visible from all directions (360 degrees) from two nautical miles away. This light must be attached at least 39 inches above the sidelights. One green starboard and one red port sidelight, visible across 112.5 degrees from one nautical mile away.

  11. USCG Navigation Lights Requirements

    Updated: November 2, 2017. USCG Required Navigation Lighting West Marine. Powerboats under 12 meters (39.4 feet) in length must have separate or combined red and green sidelights covering 112.5 degrees and visible for 1 nautical mile. The white masthead light must cover 225 degrees, be 1 meter above the sidelights and be visible for 2 nautical ...

  12. Boat Navigation Light Rules

    Powerboats up to 20 meters - Side lights, masthead, and stern lights are all required as listed above; side and stern lights must be visible to two nautical miles and masthead lights to three nautical miles. Sailboats up to 20 meter - Must show side lights and a white stern light or tricolored masthead light as listed above; all must be ...

  13. Boat navigation lights rules and requirements at night

    Navigation lights for sailboats 20 m (65'7") and over. Sidelights (red - green) and, Sternlight (white). Option 1. Option 2. Optional - A sailing vessel may exhibit at or near the top of the mast, two all-round lights in a vertical line: the upper one red and the lower one green. These lights are shown along with the sidelights and ...

  14. What Lights Are Required on a Boat at Night? A Guide to Navigation

    The table below summarizes the legal requirements for navigation lights on boats in the United States: Boat Size. Required Lights. Under 12 meters (39.4 feet) Red and green sidelights, white masthead light, and stern light. 12 to 20 meters (39.4 to 65.6 feet) Same as above, plus an all-around white light.

  15. Inspect Your Boat's Navigation Lights

    General Requirements. It's beyond the scope of this article to list every possible configuration or variation of lights, however, by way of example, a typical powerboat less than 65 feet while underway at night or in reduced visibility would require side lights, a masthead light, and a stern light.

  16. Rules for Nav Lights

    Lighting requirements are specific for the size of the boat and if she is underway. In the U.S., on powerboats shorter than 39'3" (12 meters) long must have separate or combined red and green side lights covering 112.5 degrees and visible for one nautical mile. The white stern light must cover 135 degrees and be visible for 2 nautical miles or you can substitute one 360-degree all-around ...

  17. Navigation Lights : BoatUS Foundation

    Two multiple bulb LED fixtures: Portable multiple bulb LED fixtures for both the bow and stern light - NaviLight, bi-color $49.99, white $49.99*. Portable Navigation Lights for small boats less than 7 knots - Aqua Signal, bi-color $34.99, white $34.99**. *NaviLight portable lights require 3 "AAA" batteries.

  18. Navigation Lights on Sailing Yachts and Motor Boats

    Stern light. A white light mounted as close to the stern as possible and shines dead ahead in an arc of 135° (67.5° to each side). The mounting height should be aligned to the height of the side lights and should never be higher. 3. Three-colour light for sailing vessels (sailing lights) On sail boats up to a length of 20 m, the side light ...

  19. Boat Navigation Light Rules Explained (For Beginners)

    Boats less than 12 meters or 39.4 feet long: You'll need one red light and one green light at the front port and starboard sides of the boat for these boats. These lights should be positioned so that they can be seen at an angle of 112.5 degrees. The sidelights should be strong enough to be seen from a mile away.

  20. Guide to Boat Navigation Light Requirements

    A masthead light (a white light at the front of the boat). The masthead light needs to be visible across 225 degrees and from at least two miles away. A pair of red and green side lights, each visible across 112.5 degrees and from a mile away. A stern light (a white light at the rear of the boat). The stern light needs to visible across 135 ...

  21. What Boat Lights Are Required At Night?

    When sailing at night, you'll need three types of lights, green, red and white. The green light should be on the starboard (right), the red light on the port side (left), while the white light is to be placed at the front, rear, and top of the boat. All these lights should be visible on a dark and clear night.

  22. Boat Navigation Light Requirements (Explained!)

    Here are the basic requirements for navigation lights on a boat: All boats must have a red light on the port (left) side and a green light on the starboard (right) side of the bow, visible from at least 112.5 degrees from dead ahead to 22.5 degrees abaft the beam on both sides. A white light must be visible from all around the horizon, placed ...

  23. When Should You Use Navigation Lights on a Boat?

    Navigation light requirements by boat type and length. As a boater, you should always double-check to ensure that you have the proper navigation lighting for safe and legal boating. Here are the various requirements for each type and length of boat: ... 1 all-round white light at night or 1 ball during the day, and; An additional all-round ...