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Boat under steam
a boat is approaching you head-on
Properly, it is a white light, and elevated higher than the red/green lights on the front of the boat.
If you see both the red and green lights but not the white one, the boat is coming right for you and something's wrong because the white light has to be visible from any angle for a distance of two miles. <<>> If there's no white light it's a sailing boat. If you see red and green the boat is under sail and you are lined up with its bows. A small motor boat also needs a white light high up and visible all round.
dark out
dark out
dark out
dark out
dark out
If you see both the red and green lights but not the white one, the boat is coming right for you and something's wrong because the white light has to be visible from any angle for a distance of two miles. <<>> If there's no white light it's a sailing boat. If you see red and green the boat is under sail and you are lined up with its bows. A small motor boat also needs a white light high up and visible all round.
it tells you the boat is approaching you head on
you are approaching head on.