Is a gas that follows the perfect gas laws without deviation. There is no such thing, however it is the basis from which calculations are made and corrections applied.

Capable of keeping out water.

That part of a shaft or axle that rotates or angularly oscillates in or against a bearing or about which a bearing rotates or angularly oscillates.

Six feet. Comes from the Dutch word "fadom" which was the distance between fingertips of outstretched hands.A unit of measurement relating to the depth of water or to the length of line or cable; one fathom is 6 feet or 1.83 meters

(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.

Measurement ton 40 cubic ft or one cubic meter.Net ton, or short ton 2,000 lbs.Gross ton/long ton 2,240 lbs.Metric ton/kilo ton 2,204.6 lbs.Cubic meter 35.314 cubic ft.

An instrument that, once established, cannot be modified or cancelled without the agreement of all parties concerned.

(1) In good condition. (2) To adjust to proper shape or size.

Small staysail located between the foremast and mainmast.

Tan work shoes issued to U.S. Maritime Service trainees

Sailing with the tiller over to leeward by force of the wind

A term used to describe the hot gas pressure on the outlet side of the refrigeration compression.

A weight attached to a line used to determine depth by lowering it into the water.

A ported or closed cover for the end of a filter element.

U.S. Customs' automated program under AMS. It allows for electronic reporting of inbound (foreign) cargoes in the U.S.

Combination minimum pressure valve and check valve.

The bridge used for taking observations, or directing the handling of the ship.

To store a yacht away on land for the winter

The windward side (from where the wind is blowing).

To go aboard the vessel; to put onboard a vessel.