Two yachts on different tacks are converging. Which must keep clear?
Seen from above, north at the top, wind from the north. A is a sailing yacht with her boom out to starboard, lower left of the picture, heading north-east. B is a sailing yacht with her boom out to port, lower right of the picture, heading north-west.
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Yacht A, on port tack. Port tack gives way to starboard tack. Yacht A has the wind on her port side (her boom is out to starboard), so she keeps clear.
