Glossary
Sailing has its own unique vocabulary. Use this glossary to understand some of the terms and
concepts described in this manual.
Akas A Polynesian term for the cross tubes that connect the amas to the vaka.
Aka Lock A pin that secures the aka to the ama foot or main hull socket.
Amas A Polynesian term for the outer hulls of a trimaran.
Batten A semi-rigid slat inserted into a sewn pocket (batten pocket) in the leech of the sail to
help the sail hold a desired shape.
Beam The width of a boat.
Beating Sailing a boat on alternate port and starboard tacks to go upwind.
Boom A rigid member, attached to the mast by a goose-neck, running aft. The foot of the
sail is attached to the boom.
Bow The front of the boat.
Close
Hauled Sailing very near the direction of the wind.
Ease Sheets Let a sail out by releasing the mainsheet.
Fall Off Change direction, so the boat sails at a shallower angle relative to the wind.
Gooseneck The fitting that attaches the forward end of the boom to the mast.
Gybe A change of direction initiated while sailing downwind, which causes the boom to
swing across the boat.
Head Up Change direction, so the boat sails at a more acute angle to the wind.
Heave To Stop the boat’s forward motion, normally by bringing the bow into the wind and letting
the sail luff.
Heel The angle the boat tips from horizontal, due wind pressure on the sail.
Keel A fixed fin, protruding from the bottom of the boat that prevents the boat from being
blown sideways through the water by the wind.
Knot A rate of speed equal to one nautical mile per hour.
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