The theoretical speed that a boat can travel without planing, based on the shape of its hull This speed is 1.34 times the length of a boat at its waterline. Also known as hull speed.

A weather prediction.

An able-bodied seamen entrusted with the steering of a vessel when entering or leaving a harbor. He is also involved with the use and upkeep of navigational equipment.

Electrical measurement. The output of one or several electric machines. Load also denotes the power carried by a particular circuit.

To collide with a vessel head on.

Turning out all hands on board ship in the morning, or calling the watch for duty on deck.

On a square-rigged ship, the short pieces of line which hang from the yards and support the footropes on which the topmen stand while working aloft on the sails.

British standard pipe tapered.

See Door-to-Door.

A standard numeric code developed by the United Nations to classify commodities used in international trade, based on a hierarchy.

Sailing with the wind coming from the port side, with the boom on the starboard side.

Navigation rules governing waters outside designated demarcation zones

Movement of crest of a progressive wave. Can also refer to radio waves.

To take the opposite tack when sailing to windward with another yacht.

An acid carbonate.

Is that pressure of either the motive fluid or of the ejector gas discharge which causes an ejector to become unstable.

To reverse or change directions, to turn around

A phrase often included in charter parties and freight contracts referring to local rules and practices which may impact upon the costs borne by the various parties.

Foam or spray which is thrown out under the bow of a ship when she is under way. If fast moving with a lot of spray being thrown out, the vessel is said to have "A bone in her teeth".

A nautical guy, often a negative connotation.