Understanding where the green light is placed on a boat is one of the fundamentals of yacht equipment and safe navigation. The correct placement of navigation lights is required by the International Regulations for Preventing Collisions at Sea (COLREGs), ensuring all vessels follow the same rules worldwide.
Green Light = Starboard Side
The green navigation light is always mounted on the starboard side, which means the right-hand side when facing forward toward the bow. It shines over an arc of 112.5°, from dead ahead to just behind the beam.
If another vessel sees your green light, it knows it is looking at your starboard side, helping to assess your movement and avoid collisions.
Red Light = Port Side
On the opposite side, the red navigation light is fixed on the port side (the left-hand side when facing forward). It also covers 112.5°. Together, red and green lights help sailors and ship captains immediately recognize a vessel’s direction, even at night.
Why Correct Installation Matters
When choosing boat spare parts, especially navigation light fixtures, always follow the correct system:
- Starboard (right side) = Green light
- Port (left side) = Red light
Improper installation creates confusion and risks of accidents at sea. For yacht owners and marine technicians, this is not just a detail — it’s a matter of safety.
Maintenance and Spare Parts
For reliable performance of your yacht equipment:
- Use only marine-grade navigation lights that meet COLREGs standards.
- Keep spare bulbs, LEDs, and housing parts in your boat spare parts kit.
- Regularly check for corrosion or water ingress.
- Replace worn or faulty lights before heading offshore.
Safety at Sea
The global standard of green on starboard, red on port ensures that every vessel, from a small yacht to a cargo ship, communicates position and direction clearly. Following this rule is essential for safe seamanship.
Conclusion
The green light is always installed on the starboard (right) side of a boat, while the red light is always on the port (left) side. Proper knowledge, installation, and maintenance of navigation lights are key elements of safe sailing and essential parts of your yacht equipment and boat spare parts inventory.
