The pressure encountered on the return side of a system.

A rope network.

Shapes such as angle bars or stringers welded to a surface such as a plated bulkhead to increase rigidity.

The metal axle of a block upon which the sheave revolves.

Without sufficient crew.

Galley smokestack or chimney.

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 ...

A board-shaped swinging vane, controlled by a tiller or wheel, and attached to the rudderpost or stern for steering and maneuvering a vessel.

Flapping (of sails)

Also known as PM, maintenance performed according to a fixed schedule involving the routine repair and replacement of machine parts and components.

Scoop like devices used to direct air into and ventilate a boat.

A purchase (block and tackle) for hoisting a boat to its davits.

A free port in a country divorced from Customs authority but under government control. Merchandise, except that which is prohibited, may be stored in the zone without being subject to import duty regulations.

see Chanty.

Wing-like retractable devices extending from the sides of the vessel to dampen down rolling in seas and produce a steadier, smoother, and more comfortable motion.

A rope used for additional support or for additional securing, e.g., preventer stay.

In spray painting applications, air trapped in a paint film caused by poor atomization during spraying.

The highest temperature at which well-defined liquid and vapor states exist.

This property is the ratio of the specific weight of air or gas to that of dry air at the same pressure and temperature.

The location from which the boat is steered, usually in the middle or at the stern of the boat.