Boat lights are required by the U.S. Coast Guard (USCG) for nighttime and low-visibility operation, and they play a critical role in safety, visibility, and legal compliance on the water. Whether you’re cruising after sunset, fishing at dawn, or docking in poor visibility, proper marine lighting helps other boaters see you and understand your vessel’s movement.
This guide explains why boat lights matter, outlines USCG boat lighting requirements, breaks down the different types of boat lights, and helps you choose the right lighting setup for your vessel.
Why Boat Lights Matter
Boat lights are more than a legal requirement — they are a primary safety system. When visibility is reduced due to darkness, fog, rain, or weather, navigation lights communicate your position, direction, and operating status to nearby vessels.
Proper boat lighting helps communicate:
- Direction – Red (port) and green (starboard) sidelights show which way your boat is moving
- Status – White lights indicate whether a vessel is underway, anchored, or towing
- Safety – Deck, courtesy, and utility lights improve onboard visibility and reduce trip hazards
If you need to replace or upgrade your lighting, browse our selection of USCG-approved boat lights, including LED, navigation, anchor, and utility lighting options.
U.S. Coast Guard (USCG) Boat Lighting Requirements
In general, the USCG requires boats to display red and green sidelights and a white light (stern, masthead, or all-round) when operating between sunset and sunrise or during periods of restricted visibility. The exact lighting configuration depends on your vessel type, size, and whether it is underway or at anchor.
Power-Driven Vessels Underway
- Under 39 feet – Red and green sidelights plus one all-round white light visible 360°
- Over 39 feet – Sidelights, a masthead light, and a stern light visible from behind
Sailing Vessels Underway
- Red and green sidelights and a stern light
- Sailboats under 23 feet may use a single mast-mounted tricolor navigation light
Vessels at Anchor
- An all-round white light visible from all directions
- Additional local rules may apply near shore or in designated mooring areas
Personal Watercraft (PWC)
- Often subject to state-specific regulations
- Most PWCs under 12 feet may use a single forward-facing tricolor light where permitted
View the U.S. Coast Guard International & Inland Navigation Rules
Types of Boat Lights and Their Uses
Boat lighting falls into two main categories: navigation lights, which are legally required, and auxiliary lights, which enhance safety, functionality, and comfort.
Navigation Lights
Navigation lights are required under USCG regulations and allow other vessels to identify your boat’s position, direction, and activity.
Masthead Light
A masthead light is a white forward-facing light mounted on the centerline of a vessel. It shows an unbroken 225° arc of visibility and is required on most power-driven boats.
Sidelights (Bow Lights)
Sidelights are red (port) and green (starboard) lights mounted at the front of the vessel. Each shows a 112.5° arc and helps indicate a boat’s direction of travel.
Stern Light
A stern light is a white light mounted near the rear of the boat, visible over a 135° arc. It allows other vessels to see you from behind.
All-Round and Towing Lights
- All-Round Lights – Emit a 360° white light and are commonly used as anchor lights
- Towing Lights – Yellow lights with a 135° arc used when towing another vessel
Other Common Boat Lights
Additional lighting improves onboard safety and convenience but does not replace required navigation lights.
LED Boat Lights
LED boat lights are energy-efficient, long-lasting, and durable. They are commonly used for both navigation and interior lighting.
Docking Lights
Docking lights illuminate the area ahead of your boat, making nighttime maneuvering safer and easier.
Courtesy Lights
Courtesy lights provide soft illumination for steps, decks, and walkways without compromising night vision.
Spotlights and Floodlights
Spotlights and floodlights offer high-intensity illumination for navigation, docking, and search applications.
Choosing the Right Boat Lights
- Confirm USCG approval for navigation and anchor lights
- Verify voltage compatibility (typically 12V)
- Select marine-grade, corrosion-resistant materials
- Consider LED lighting for efficiency and reliability
Boat Light FAQ
What lights are required on a boat?
Boats must display red and green sidelights and a white light when operating at night or in reduced visibility. The exact configuration depends on vessel type and size.
Do all boats need navigation lights?
Yes. Power-driven and sailing vessels must use navigation lights between sunset and sunrise or when visibility is limited.
Are LED boat lights legal?
Yes, as long as they meet USCG requirements for brightness, color, and placement.
What’s the difference between an anchor light and an all-round light?
An all-round light shows a 360° white light. When displayed on a stationary vessel, it functions as an anchor light.
Can I use colored accent lights while underway?
Interior accent lighting is acceptable, but exterior colored lights other than required navigation lights can confuse other boaters and should not be used while moving.
Stay Safe with the Right Boat Lights
Boat lights are essential for safe, legal, and enjoyable boating. Whether you’re replacing outdated fixtures or upgrading to modern LED systems, proper lighting ensures visibility and compliance every time you’re on the water.
Explore our full selection of Boat Lights & LED Marine Lighting to find the right solution for your boat.