The error in a compass reading caused by the heel of a boat.

The average level of the oceans, used when finding water depths or land elevations.

To let out a line or sail slowly; to slacken or relieve tension on a line; to take pressure off.

An enterprise in which there is a risk of loss.

To go aboard the vessel; to put onboard a vessel.

The visible portion of the electromagnetic spectrum with wavelengths from 0.4 to 0.76 microns

The liquid material remaining from pulpwood cooking in the soda or sulfate paper-making process.

A type of heat pump that uses sealed horizontal or vertical pipes, buried in the ground, as heat exchangers through which a fluid is circulated to transfer heat.

Rolling a vessel, that is slightly ice-bound, so as to break the surface ice around her. May sometimes be done when a vessel is lightly aground, but not ice-bound.

See: 'day.

Twenty Foot (Container) Equivalent

Each taxpaying individual in the UK is entitled to an annual exemption of

Combination minimum pressure valve and check valve.

In sailing, to be lifted by a wind shift that allows your boat to be lifted closer to the wind where by it allows you to sail a shorter distance to the next mark, buoy or finish line

A clock-driven instrument mounting which automatically and continuously points in the direction of the sun. It is used with a pyrheliometera,hen continuous direct solar radiation measurements are required.

A machine employing two or more stages.

Construction Reserve Fund.

A spar used to prevent the spinnaker guy from fouling on the stanchions.

Cargo landed in excess of the quantity on manifest.

An accelerated corrosion test for some electrodeposits for anodic coatings on aluminum.