The principal sail that is set on the main mast.

An electrical depth sounder or fish finder that uses sound echoes to locate the depth of objects in water. It does so by timing the sound pulses.

An industry abbreviation for "Hazardous Material."

Gross tonnage is the basis on which manning rules and safety regulations are applied, and registration fees are reckoned. Port fees are also often reckoned on the basis of GT and NT. GT and NT are defined according to formulas which take account, among ot ...

(Delivered Ex Quay, [Duty Paid]) (...Named Port of Destination):A Term of Sale which means the DDU term has been fulfilled when the goods have been available to the buyer on the quay (wharf) at the named port of destination, cleared for importation. The s ...

Indirect heat exchanger designed to transfer heat from combustion gas to the air stream added to the combustion zone.

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.

A small rail on tables and counters used to keep objects from sliding off when the vessel rolls and pitches.

A day for general ship cleaning.

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.

A compartment having a watertight bulkhead at each end.

Also VMG. Actual boat speed after adjusting for such factors as current and leeway.

Transportation charge advanced by one carrier to another to be collected by the later carrier from the consignor or consignee.

see Gybe

After mast on a schooner or sailing ship carrying a spanker; usually the fourth mast of a five or six masted schooner.

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.

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

The framework of timber, etc., on which a vessel is built, from which she is launched into the water.

An order meaning sufficient (enough).

Is one which 1) handles a small constant flow of liquid with the gas; 2) utilizes evaporative (injection) cooling; or 3) circulates a liquid for sealing and/or cooling. The last may or may not be evaporative cooling.