A machine employing two or more stages.

Slang for getting married. A splice joins two lines together permanently.

A salt or ester of carbonic acid.

Ropes hung and used for assistance in ascending and descending.

A line led to a sail, but is not currently in use. The line currently in use is known as the working sheet. Usually the working and lazy sheets change when the boat is tacked.

A bulkhead that will not let water pass from one side of it to the other.

The compression of an air actuator (air spring) below its design height.

Cargo which has been booked but does not arrive in time to be loaded before the vessel sails. See also "Windy Booking."

Maintains and monitors radio, sends and receives messages. Often maintains electronic navigation. Latest replaced with certified GO (Deck officer)

To let out a line or sail slowly; to slacken or relieve tension on a line; to take pressure off.

Uncharted navigational danger that has been reported but has not been verified by survey.

A boat is double banked, when two oars, one opposite the other, are pulled by men seated on the same thwart.

The windward side (from where the wind is blowing).

An absolute temperature scale. (

A navigational aid with a light that flashes about once per second.

A projecting aperture at the end of a tube, pipe etc. serving as an outlet for compressed air. Reduces the demand on the compressor by generating the highest thrust and volume for the lowest possible air consumption.

Circular iron band used to hold a bowsprit on the stem of a sailing vessel.

(1) To throw, as to heave a line ashore. (2) An upward pull on a line; to lift (3) The rise and fall of a vessel in a seaway.

A wind shift that forces a boat to sail below its mean wind course.