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

The principal sail that is set on the main mast.

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.

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

The ability of a boat to keep from being moved sideways by the wind. Keels, daggerboards, centerboards, and leeboards are all used to improve a boat's lateral resistance.

A distinctive fixed reference point that can be used for navigation.

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.

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

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.

The average level of the oceans, used when finding water depths or land elevations.

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.

Warehouse Withdrawal for Transportation Immediate Exportation.Allows merchandise that has been withdrawn from a bonded warehouse at one U.S. port to be exported from the same port exported without paying duty.

A platform with or without sides, on which a number of packages or pieces may be loaded to facilitate handling by a lift truck.

(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 ...

A sprocket wheel on the windlass for taking links of the chain cable.

see Gybe

A day for general ship cleaning.

A condition where the particles (dust) becomes embedded in the fabric filter over time and are not removed by the bag cleaning process.

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

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