kendall wrote: if you see a ships green light it means you have the right of way.

Sometimes.

Stanron wrote: Navigation lights on a boat show green on the forward right quarter, red on the forward left quarter and white astern.

among other lights.

Lights on buoyed channels show red on the left and green on the right on entering a channnel

in some parts of the world.

Heard the story about the US warship and the lighthouse?