The magnetic compass used by the navigator as a standard.

An object made with more than one type of material.

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.

A coating or precipitate deposited on surfaces such as water pipes, steam boilers that are in contact with hard water. Water that contains carbonates or bicarbonates of calcium or magnesium are likely to cause scale when heated.

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

The number of revolutions per minute of the compressor shaft.

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.

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

The speed needed for a boat to begin planing.

In sailboat racing, to take to opposite tack of the rest of the fleet when behind, hoping that the wind will shift to your benefit.

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

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.

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.

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

A spring line tied from the boat to chain rode, usually near the water's surface. It helps disperse tension forces. It also prevents damage to the boat by ground tackle and can help in the retrieval of the ground tackle in heavy weather.

PSI - Pounds per square inch.

Pair of hooks linked together and attached to a crane.

A common measurement of the internal volume of a ship with certain spaces excluded. One ton equals 100 cubic feet; the total of all the enclosed spaces within a ship expressed in tons each of which is equivalent to 100 cubic feet.

Canvas, cloth, leather, tubing, rubber or other material placed around a line or cable to protect it from wear and abrasion

A symbol placed on packages for identification purposes; generally a triangle,square, circle, etc. with letters and/or numbers and port of discharge.