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 ...

The number of revolutions per minute of the compressor shaft.

A distress call made by a vessel requiring assistance. These three letters were chosen because they were easy to make and read using Morse Code. Some believe the letters meant "Save Our Ship" or "Save Our Souls".

A soft, black, mayonnaise-like deposit which is typically an emulsion of oil, water, and oil insolubles.

An instrument with a movable arm to plot a course on a chart

A built in mechanical device to recover a portion of the power consumed by a constant speed centrifugal compressor when operating at reduced capacity or reduced pressure rise, or both.

Pair of hooks linked together and attached to a crane.

A rope sewn into the luff or foot of a sail for use in attaching to the mast or boom.

The renting of a boat

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 legally binding agreement between two or more persons/organizations to carry out reciprocal obligations or value.

A compartment forward where the chain cable is stowed.

Towards, near, or at the bow; Prefix denoting at, near, or toward the bow.

Small, circular sheets of newly-formed ice that do not impede navigation.

The logic of binary systems, such as control systems in which all operations may be reduced to on-off, open-closed, or similar dichotomous basis.

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 line of longitude 180 degrees opposite Greenwich, England, located in the Pacific that marks the date change

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

A device that indicates pressure differential above or below atmospheric pressure.

An organization established by the members of an ocean conference acts as a self-policing force with broad authority to investigate tariff violations, including authority to scrutinize all documents kept by the carriers and their personnel. Violations are ...