The highest navigation bridge. It usually includes an added set of controls above the level of the normal control station for better visibility.

The turbulent effect of air on the lee side of a sail when trimmed in too far.

A blast of from 4 to 6 seconds' duration.

A filter element whose medium consists of a series of uniform folds and has the geometric form of a cylinder, cone, disc, plate ... Synonymous with "convoluted" and "corrugated".

Galley smokestack or chimney.

BTU. The amount of heat required to raise the temperature of one pound of water one degree Fahrenheit under set conditions of temperature and pressure.

Also known as (U.S.) Federal Bill of Lading Act of 1916. U.S. federal law enacting conditions by which a B/L may be issued. Penalties for issuing B/L's containing false data include monetary fines and/or imprisonment.

The number of revolutions per minute of the compressor shaft.

Achieved when the air compressor is running at full RPM with a fully opened inlet and discharge, delivering the maximum volume at the rated pressure.

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 ...

Arrangements with a carrier for the acceptance and carriage of freight; i.e., a space reservation.

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.

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".

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 ...

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

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

A compartment forward where the chain cable is stowed.

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.

Is the temperature at which oil begins to flow under prescribed conditions.

Blocks of wood made to fit in the hawse-holes, or holes in the half-ports, when at sea. Those in the hawse-holes are sometimes called hawse-blocks.