A type of anchor with a heavy inverted mushroom shaped head. Mushroom anchors are used to anchor in mud and other soft ground.

Artificial objects to supplement natural landmarks indicating safe and unsafe waters.

A single turn of rope when a rope is coiled down.

An absolute temperature scale. ((

Intimate mixture of oil and water, generally of a milky or cloudy appearance. Emulsions may be of two types: oil-in water (where water is the continuous phase) and water-in-oil (where water is the discontinuous phase).

A suitable beach, being steep and sandy, where ships could be careened for cleaning or repair.

Thread - Unified national coarse.

A suspension of fine solid or liquid particles in a gas.

The International Convention for the Prevention of Pollution from Ships, 1973, as modified by the Protocol of 1978.

A condition within the letter of credit which restricts its negotiation to a named bank.

A compressor cooled by atmospheric air circulated around the cylinders or casing.

To charge less than the proper amount.

Member of a crew who works all day but does not keep the normal watches.

Is a technique for predicting whether water will tend to dissolve or precipitate calcium carbonate. If the water precipitates calcium carbonate, scale forming may result. If the water dissolves calcium carbonate, it has a corrosive tendency.

Navigable channel.

A pear-shaped, grooved metal fitting around which an eye splice is made

Direct current. A continuous, one directional flow of electricity

An indentation of the coastline between two headlands.

Before the introduction of man-made fibers, much of the rope used at sea was made from manila. Made from the fibers of banana plants in the Philippines, manila did not rot when it was exposed to seawater.

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.