The degree to which all the forces on a boat are symmetrical so the vessel sails with just a slight weather helm.

As tight as can be pulled by hand.

A gauge that measures air flow as a percentage of capacity, used in rotary screw compressors as an estimator during modulation controls.

The course of a vessel after magnetic variation has been considered, but without compensation for magnetic deviation.

International Labor Organization; Based in Geneva, it is one of the oldest components of the UN system of specialized agencies and has been involved over the years in appraising and seeking to improve and regulate conditions for seafarers. In its unusual ...

The distance between the water level at chart datum and an overhead obstacle such as a bridge or power line.

The distance between a rope's adjacent strands, giving a measure of the tightness of the lay. The shorter the distance, the harder the lay. When a line has been overused and the lay has become slack, it is said to be slack-jawed.

An industry abbreviation for "Hazardous Material."

(1) A wind shift further forward relative to the boats direction or heading. (2) A bar or angle under a deck the same size as deck beams. It is used around stair openings in deck, small hatch openings, or at dead end of longitudinals.

Cargo more than eight feet high which thus cannot fit into a standard container.

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

See Intracoastal Waterway.

Small cask used for carrying drinking water in a boat.

A pump which is used to deliver air to the aquarium. The pump pushes air through silicon tubing and to air stones or other aquatic decor. They are also an essential for UGF's (undergravel filters). An air stone is placed in each clear tube. When the air b ...

(1) The last position on a chart, when a ship is leaving the land.(2) The number of nautical miles that one place is eastwards or westwards of another. (3)The easting or westing made by a vessel. The bearing of an object on the coast from which a vessel c ...

To stand at the mast and pull down on a halyard as another crewmate winches it in.

Pressure dew point temperature (

Sling of various types used for lifting vehicles on to and off general cargo ship.s

Is the ratio of the computed isentropic temperature rise to the measured total temperature rise during compression.

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