According to SOLAS 2000-Amendments and IMO MSC/Cir. 913 vessels constructed on and after 1st July 2002 have to be provided with type approved fixed water-based local fire-fighting systems in addition to the main system.

A propulsor that consists of a water inlet channel with inlet located in the bottom of the ship, a pump that accelerates the water and a nozzle.

Waterjet propulsion is often choosen instead of conventional propellers for vessels requiring high speeds, shallow draught, protected propulsion, high manoeuvrability at all speeds, low noise emissions for military applications and low vibration.

An imaginary line on a ship side parallel to the base at a particular draft.

The area of a hull at a particular horizontal plane, i.e. within the waterline.

Capable of preventing the passage of water through the structure in either direction with a proper margin of resistance under the pressure due to the maximum head of water which it might have to sustain, (ICLL).

A door which is fitted in a watertight bulkhead and able to open vertically or horizontally. It is operated by a hydraulic mechanism either locally or remotely.

A drawing showing the main and local watertight subdivision as well as internal openings and closing devices thereof.

A wattmeter is an instrument for measuring the electric power in watts of any given circuit.

Unit used for the power rating of photovoltaic installations, "one kilowatt-peak" meaning "one kilowatt of peak power".

The travelling undulation of the surface of a liquid. The wave crest moves as the individual surface particles rise and fall but there is no forward motion of the liquid.

A machine that converts wave energy into usable mechanical energy.

A wave farm is a collection of machines in the same location and used for the generation of wave power electricity.

Energy that is generated by harnessing the forces from waves.

Wave propagation is any of the ways in which waves travel.

In physics, the wavelength is the spatial period of a periodic wave—the distance over which the wave's shape repeats.

The maximum static angle of the heel produced by the fin, expressed in degrees

The deterioration of a surface due to relative motion between it and another.

A depth gauge which is inserted into the stern frame boss and through the sterntube bearing to measure the wear that has occurred in the bearing.

A device used to receive weather reports.