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To tack a sailing vessel by turning its bow through the wind.

As the bow crosses the wind, the sails cease drawing and then fill on the opposite side, placing the vessel on the other tack. The command may initiate a coordinated sequence of helm movement and releasing and trimming sheets, but exact calls and actions vary with the vessel and crew.

A successful manoeuvre requires sufficient speed, sea room and control of the sheets and helm. Turning too slowly, losing momentum or releasing and trimming at unsuitable times can leave the vessel in irons or expose people to loaded and rapidly moving lines.