Alternator

An engine-driven generator that converts mechanical rotation into alternating current, which on a yacht is then rectified to charge the house and starter batteries while the engine runs.

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Related A-terms

Aground

The condition of a vessel whose keel or hull is in contact with the seabed.

Asymmetric spinnaker

A downwind sail (also called a cruising chute or gennaker) with a fixed tack but no pole, …

Astern

In the water behind the vessel, or moving backwards.

Adrift

Afloat with no means of propulsion or attachment, carried along by wind, current, or tide.

ARPA

Automatic Radar Plotting Aid — radar software that tracks targets automatically and comput…

Anchor windlass

An electric or manual winch mounted on the foredeck that hauls and lowers the anchor chain…

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