The power required at the compressor drive shaft. Losses in external transmissions such as gears and belt drives are not included.

A sea running in a direction contrary to the wind, which can be confused and dangerous.

A thick serge jacket worn by seamen while keeping watch at night or in stormy weather.

Part of the standing rigging that helps to support the mast laterally by running from the top of the mast to the side of the boat. Sailboats usually have one or more shrouds on each side of the mast. Some people call them side stays

An urgent message used on a radio regarding the safety of people or property. A PAN PAN message is not used when there is an immediate threat to life or property, instead the MAYDAY call is used. PAN PAN situations may develop into MAYDAY situations. As w ...

Temporarily placed longitudinal bulkheads used to prevent bulk cargo from shifting.

An adiabatic compression with no increase in entropy; a reversible-adiabatic compression.

(1) Said of seas that break over a vessel or over a sea wall. (2) A whale breaches when it leaps out of the water.

Sideward force created by a spinning propeller.

An all around white light displayed at night by a ship when she is anchored.

A synthetic rubber frequently used for vessel and liquid filter element gasket.

Seller is responsible for the cost of placing the goods at a named point of exportation. Some European buyers use this form when they actually mean FOB vessel.

Flat bottomed vessel with a shallow draught.

see Devil

A piece of wood fitted in various places to act as a preventative to chafe.

When an anchored vessel is forced, by wind or current, to swing across her anchor so as to risk fouling it with her own cable, she is said to break sheer.

The short aftermost raised deck of a vessel.

The pressure at which a pressure operated valve begins to pass a gas.

A line used to control the tension along a sail's luff in order to maintain proper sail shape.

A buoy secured to a permanent anchor sunk deeply into the bottom.