The Captain of a vessel. Highest officer aboard ship. Oversees all ship operations. Keeps ships records. Handles accounting and bookkeeping. Takes command of vessel in inclement weather and in crowded or narrow waters. Handles communications.

The highest continuous deck which runs the full length of the ship without a fall or interruption.

A large foresail or jib that overlaps the mainsail. Also known as a genny. Can be expressed in percentages of overlap, e.g. 150 Genoa is 50% overlap of the mainsail.

The operation of taking a sounding with the hand lead (to find bottom).

Said of a lighthouse not tended.

A soft, cylindrical fabric bag for clothes and personal possessions

The white froth on the crests of waves.

Transportation charge advanced by one carrier to another to be collected by the later carrier from the consignor or consignee.

U.S. Customs' automated program under AMS. It allows for electronic reporting of inbound (foreign) cargoes in the U.S.

To store a yacht away on land for the winter

Weight of the goods alone without any immediate wrappings, e.g., the weight of the contents of a tin can without the weight of the can.

United Nations EDI for Administration, Commerce and Transport. EDI Standards are developed and supported by the UN for electronic message (data) interchange on an international level.

The bearing of an object after magnetic variation has been considered, but without compensation for magnetic deviation.

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.

Also saloon; the main social cabin of a boat

Secure hatches and loose objects both within the hull and on deck.

A term indicating a temperature relationship between two temperatures or temperature variation between two points.

Alternatively letting the sails draw, then spilling wind so as to keep a vessel more or less in one place until space is available, marking time.

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

Is the ratio of the polytropic compression energy transferred to the gas to the actual energy transferred to the gas.