Space between the floor of holds and the bottom of the ship.

In navigation, the angle between the point at which the sun rises and sets and the true east and west points of the horizon.

Is the pressure existing at a given temperature in a closed vessel containing a liquid and the vapor from that liquid after equilibrium conditions have been reached. It is dependent only on temperature and must be determined experimentally.

A light showing an unbroken light over an arc of the horizon of 360 degrees. An anchor or riding light is an all-round light.

A mat of fibers that provide a barrier to particles entrained in the flow of air or gas.

Oscillations of the sea caused by wind blowing along the surface and moving in the direction from which the wind blows.

An electrical current that periodically reverses its direction. Standard in US and Canada is 60 cycles per second. Europe and other countries is 50 cycles per second.

the attraction to, and retention of particles in, a filter medium by electrostatic forces, or by molecular attraction between the particles and the medium.

A method of preventing the ends of a line from unlaying or fraying by turns of small stuff, stout twine or seizing wire with the ends tucked.

On the lee side of an object, protected from the wind.

Insufficient number of crew; shorthanded.

The direct sailing line in which a racing mark or buoy can be fetched while sailing the desired course

A thermal expansion valve.

Away from land, toward the water.

The compass points of North, East, South and West. Intercardinal or half-cardinal points are Southeast, Southwest, Northwest and Northeast

A journey made at sea by a vessel, usually including both the outbound and homebound passages.

Inlet butterfly valve. These are fitted on the inlet of most types of compressor and the valve opens and closes to throttle the air flow. However, the term IBV is usually associated with turbo compressors.

A spring line from the stern of a boat to mid ships to stop forward movement

Shifting the moving block of a tackle from one place of attachment to another place farther along to give more advantage.