The basic set of navigation lights on boats and ships, including sailboats, over 5m length. Running lights are red, white and green.
- The red light must be mounted on the port side of the vessel and be visible from the front as well as the side.
- The green light must be mounted on the starboard side of the vessel and be visible from the front as well as the side.
- The white light must be mounted astern and be visible from behind.
Unless there is a reason to do otherwise, ships will pass on each others' right side, verbally expressed with the phrase "green green," meaning each one can see the other's green (starboard) running light.
Aircraft also use the red/green combination, with the white light on the tip of the tail.