The area (in sq inches) of the filter element that is exposed to the flow of air or fluid for effective filtering.

A point of sail where the boat is sailing at a right angle to the wind (wind coming from abeam). A beam reach is usually the fastest point of sail. A beam reach is a point of sail between a broad reach and a close reach.

To make life onboard for the crew as uncomfortable as possible, by keeping them at work at all hours, often unnecessarily.

A small vessel fitted for towing.

The difference between magnetic north and true north, measured as an angle. Magnetic variation is different in different geographic locations, so the nearest compass rose to each location on a chart must be used.

A schedule of all ports to be visited on a ship's cruise, with dates of arrival and departure and the local agents' names and addresses

A device for mounting cylinders.

Heat cannot, of itself, pass from a colder to a hotter body.

A device consisting of a heat transfer system, a moisture elimination system and a refrigeration system designed to improve the quality of the air and reduce the temperature of the air.

Man or boy employed in sailing deep-water craft. Word is sometimes loosely used to include men who go to sea. Used officially to denote a seaman serving on deck.

The art and science of designing vessels.

A fluid (as hydrogen or air) that tends to expand indefinitely. Is one of three basic phases of matter.

A boat which uses the wind as its primary means of propulsion.

The after section of the propeller shaft.

A unit used when measuring atmospheric pressure. 33.86 millibars.

Areas of the ocean lying between the mostly westerly winds of the higher latitudes, and the trade winds. These areas usually have prolonged calms, and in the older days of sail it could take quite a while to clear out of this area, by which time the seame ...

A coupling device which consists of a spring loaded shutoff valve and a positive locking mechanism. It is used to connect tools, hoses and other accessories. Also known as Quick Disconnect.

Heat cannot, of itself, pass from a colder to a hotter body.

A low headroom space below decks used for provisions or spare parts, or miscellaneous storage.