A term indicating a temperature relationship between two temperatures or temperature variation between two points.

Annual publication of astronomical data for the use of navigators.

A warning from aloft (heads up).

An opening such as a hole or vent. An opening through which air can pass, or a restricted opening placed in a pipe line to provide a means of controlling or measuring flow.

A sighting taken for celestial navigation at noon, when the sun is at its highest point in the sky.

To leave a ship without authority (deserting).

Having a shape that that is not adversely affected by wind flowing past it.

Cargo landed in excess of the quantity on manifest.

A call requesting direction in answer to the report of a lookout that an object has been sighted.

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

Also VMG. Actual boat speed after adjusting for such factors as current and leeway.

When the water has large or breaking waves in stormy conditions.

A timber or rib of a ship running from the keel to the side rail; the transverse strengthening members in a ship's hull that extend from the keel to the deck or gunwale. The frames form the shape of the hull and act as a skeleton on which the hull plankin ...

Cargo more than eight feet high which thus cannot fit into a standard container.

Sixteenth-century term for a sea distance at which high land could be observed from a ship. Varied between 14 and 22 miles according to average atmospheric conditions in a given area.

Warehouse Withdrawal for Transportation Immediate Exportation.Allows merchandise that has been withdrawn from a bonded warehouse at one U.S. port to be exported from the same port exported without paying duty.

The principal sail that is set on the main mast.

A cargo on which the transportation charge is assessed on the basis of weight.

Kilograms per square centimeter absolute.