States that equal volumes of all gases under the same conditions of pressure and temperature contain the same number of molecules.

A knot used to temporarily shorten a line.

An aid to taking as astronomical sight with a sextant when the sea horizon is obscured through haze, fog, or darkness.

A gangway or gangplank. Used to cross from one ship to another, or from a ship to a pier.

The warehouse or public stores to which samples of imported goods are taken to be inspected, analyzed, weighed, etc. by examiners or appraisers.

Deck supported by pillars, fastened to pontoons. The pontoons are half submerged during operations. Kept in position by anchors (or by dynamic positioning). Normally equipped with its own propulsion machinery.

A navigational aid that emits radio waves for navigational purposes. The radio beacon's position is known and the direction of the radio beacon can be determined by using a radio direction finder.

Shipped under rate that includes cost from end of ship's tackle at load port to end of ship's tackle at discharge port.

Is one that does not enter into known chemical combination, either with itself or another element. There are four known gases of this type: helium; neon; argon and krypton. or a gas that does not supply any of the needs of combustion.

An adsorption type material used in compressed air dryers. Industry standards are activated alumina, silica gel and molecular sieves.(2) A material used to desiccate (dry) or dehumidify air.

The direction of an object (with reference to you, your ship, another object).

Area of high barometric pressure where the wind circulates clockwise in the Northern Hemisphere, and counter-clockwise in the Southern Hemisphere. These are fair weather systems with light or moderate winds.

Wind blowing from off the shore.

A pair of additional backstays temporarily rigged to provide extra support to the masts of square rigged vessels when sailing downwind.

Government officials responsible for regulating goods, services and supplies into a country.

Sailor's term for soot or ashes which sometimes fell into food while it was being cooked.

On or near the line of immersion of a ship's hull.

Speed Over Ground, speed relative to bottom.

Person who assists in saving life or property from a vessel wrecked near the coast. Often applied to a small boat that lies in narrow waters ready to wait on a vessel, if required.

Pieces of plank bolted to the outer end of the bowsprit, to reeve the foretopmast stays through.