Understanding Starboard Navigation Light Colors: 1 Minute to Grasp Navigation Light Essentials

Nautical navigation depends on a standardized set of light colors to signal a vessel’s direction and movement to others on the water. Central to this system are the red and green navigation lights, which indicate a vessel’s port (left) and starboard (right) sides, respectively. Specifically, the starboard navigation light always emits a green color. This green light shines from the front (bow) to 112.5 degrees down the right (starboard) side of the boat, and is easily distinguishable from the red port light, which covers the left side at the same angle.

These navigation lights are especially vital at night or in poor visibility, helping to prevent collisions by letting other boats know which side of your vessel they are facing. If you see a green light approaching, you are on the starboard side of another vessel—that is, their right as they face forward. International maritime regulations (like COLREGS) stipulate this scheme to maintain consistency and safety worldwide. The correct installation and maintenance of navigation lights are essential for both legal compliance and the well-being of passengers and crew.

As a designer, I see parallels between these clear communication systems and the clarity needed in room planning for interior spaces—using visual cues, defined elements, and standardized “signposts” ensures everyone understands spatial relationships and intended flows, ultimately creating safer and more navigable environments.

Tips 1:

When inspecting or installing navigation lights, always confirm the angles and visibility specified by boating laws. Replace bulbs or LED modules with ones specifically rated for marine use, and periodically clean the lenses to avoid diminished performance. Just as in interior design, appropriate placement and maintenance make all the difference in function and safety.

FAQ

Q: What color is the starboard navigation light?

A: The starboard navigation light is always green.

Q: What angle does the starboard light cover?

A: The green starboard light covers an arc of 112.5 degrees, from bow to starboard side.

Q: Why are navigation lights necessary on boats?

A: Navigation lights help vessels identify each other's orientation and prevent collisions, especially at night or in poor visibility.

Q: What do you see if you encounter a green light on another boat?

A: You are looking at the starboard (right) side of the other vessel.

Q: Are starboard and port navigation light colors standardized globally?

A: Yes, maritime regulations worldwide designate green for starboard and red for port to ensure consistency and safety.