Competent Crew Quiz · Points of sail 
Seen from above, wind from the top. A yacht sailing down and to the right turns her stern through the wind and ends up sailing down and to the left.
The yacht turns her stern through the wind, as shown. What is this called?
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Gybing. Gybing turns the stern through the wind, and the boom swings right across the boat. The helm calls "Stand by to gybe", then "Gybe-oh".