Member of a crew who works all day but does not keep the normal watches.

See Intracoastal Waterway.

The process of plotting a theoretical position or future position based on advancing from a known position using speed, time, and course, without aid of objects on land, of sights, etc. Term comes from deduced reckoning, abbreviated first to "ded reckonin ...

An industry abbreviation for "Hazardous Material."

Is a measure of the rate of change of viscosity with temperature. Oils with high VI have low viscosity changes.

1,000 board feet. One MBM equals 2,265 C.M.

The small triangular space found at the intersection of lines of position on a chart when a ship's position is determined by taking three bearings.

The behavior of perfect gases, or mixtures thereof, follows a set of laws. Boyle' law, Charle's law, Amonton's law, Dalton's law, Amagat's law, Avogadro's law, Poisson's law.

In the days of tall ships the barometer was a glass vessel with a thin stem. The fluid in the glass (in most cases water) would move up and down the stem as the pressure of the surrounding atmosphere changed. These movements were used to predict changes i ...

An opening such as a hole or vent. An opening through which air can pass, or a restricted opening placed in a pipe line to provide a means of controlling or measuring flow.

Holes cut in a plate to make it lighter and yet not reduce its strength.

see Gybe

A suitable beach, being steep and sandy, where ships could be careened for cleaning or repair.

Is the suction pressure attained by an ejector or positive displacement vacuum pump at zero capacity with the suction absolutely blanked off.

(1) Old nickname for a sailor, who would treat his canvas coats and hats with tar as a protection against the weather. (2) The distilled residue of gum extracted from pine trees, used for preserving many things.

Light, bulky articles.

A metal air-tight tank built into a boat to insure flotation even when the boat is swamped.

A cargo on which the transportation charge is assessed on the basis of weight.

A timber or rib of a ship running from the keel to the side rail; the transverse strengthening members in a ship's hull that extend from the keel to the deck or gunwale. The frames form the shape of the hull and act as a skeleton on which the hull plankin ...

The principal sail that is set on the main mast.