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

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).

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

(1) To lean over to one side, due to wind pressure on the sails or crew on the side; The amount that a boat is tipped over side-to-side, relative to its normal horizontal position. (2) The after end of a ship's keel. (3) The lower end of a mast.

Cargo which has been booked but does not arrive in time to be loaded before the vessel sails. See also "Windy Booking."

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.

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

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

An absolute temperature scale. ((

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

Thread - Unified national coarse.

Direct current. A continuous, one directional flow of electricity

A day for general ship cleaning.

Navigable channel.

An electrical depth sounder or fish finder that uses sound echoes to locate the depth of objects in water. It does so by timing the sound pulses.

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

(1) Old nickname for a sailor, who would treat his canvas coats and hats with tar as a protection against the weather. (2) The distilled residue of gum extracted from pine trees, used for preserving many things.

The air compressor continues to run, usually at full RPM, but no air is delivered because the inlet is either closed off or modified, not allowing inlet air to be trapped.

A floating log

Black diamond, ball, and cone shapes hoisted on vessels during the day to indicate restricted movement, ability, or type. For example three balls means aground.