General term for any device that measures precipitation: principally a rain gauge or snow gauge.

Applies to vessels, not to cargo, (0.2+0.02 log10V) where V is the volume in cubic meters of all enclosed spaces on the vessel.

See calorie.

Marine Rescue Sub-Centre

Are load carrying machine elements permitting some degree of motion in which the lubricant is air or some other gas.

The succession of stages through which water passes on the ground and in the atmosphere: evaporation from land or bodies of water, condensation to form clouds, precipitation, accumulation in the soil or in bodies of water, and re-evaporation.

(SEE NEAPED)

A motor controller that regulates the air flow through an end plate into the motor to control the speed and power. A speed regulation device built into or attached externally.

Sailor's name for the north star, Polaris, which for all practical purposes remains fixed above the north pole, bearing north from everywhere in the northern hemisphere, making it a true aid to navigation.

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.

The outer resin surface of a fiberglass boat, usually colored.

The ratio of the actual water-vapor partial pressure to its saturation pressure at the same temperature. (considered only with atmospheric air).

Pieces of hard wood bolted to the outer end of a bowsprit through which are rove the foretopmast stays before they are brought in to the bows and secured.

On the land or aground.

Speed Over Ground, speed relative to bottom.

To send electricity through a electricity transmission and distribution network; a conductor or power line that is carrying current.

A point of sail where the boat is sailing at a right angle to the wind (wind coming from abeam). A beam reach is usually the fastest point of sail. A beam reach is a point of sail between a broad reach and a close reach.

The outer layer on a coalescing filter that prevents separated liquids from re-entering the air stream. Also known as anti re-entrainment barrier.

A momentary decrease in the speed of the wind.

Any emission of light at temperatures below that required for incandescence.