Yacht A, under sail, is catching up with motor fishing boat B from behind. Which keeps clear?
Seen from above, north at the top. A is a sailing yacht with her boom out to starboard, lower centre of the picture, heading north. B is a motor boat, upper centre of the picture, heading north.
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Yacht A, because she is overtaking. An overtaking vessel always keeps clear, whatever kind of vessel she is. That beats "power gives way to sail". If in doubt whether you are overtaking, assume you are.
