A sudden squall of wind accompanied by lightning.

A board that can be raised and lowered by pivoting in a watertight box called the trunk or well to increase the draft and lateral area of the hull, preventing the boat from sliding sideways. Unlike a daggerboard, which lifts vertically, a centerboard pivo ...

In sailboat racing, a tactical maneuver to lock in a competitor by tacking on them in close proximity so they can not tack from under your boat and they start to lose speed due to your sails blocking their sails.

The basic unit of measurement for lumber. One board foot is equal to a oneinch board, 12 inches wide and one foot long. Thus, a board ten feet long, 12 inches wide, and one inch thick contains ten board feet.

The magnetic compass used by the navigator as a standard.

The highest unlicensed rating in the deck department who has immediate charge of all deck hands and who in turn comes under the direct orders of the master or chief mate or mate.

The location from which the boat is steered, usually in the middle or at the stern of the boat.

Specially designed for the transport of chemicals.

A marine hardware store.

Scoop like devices used to direct air into and ventilate a boat.

Is a positive displacement reciprocating compressor using a flexible membrane or diaphragm in place of a piston.

A rope network.

An old naval saying to indicate those young men who, through birth or connection, were able to enter the Royal Navy without examination. Their subsequent promotion was assured.

The speed needed for a boat to begin planing.

The operation of secretly bringing goods into a country to avoid paying duty on the goods. Also applies to illicit goods.

Starboard.

An official signature or seal affixed to certain documents by the consul of the country of destination.

Sails that lie in the direction of the ship's length and whose luffs abut the masts or are attached to stays.

Said of a vessel's anchor, or cable when the amount of cable out is not more than one-and-a-half times the depth of water.

A volume. Cubic meters per second.