Determination of the dutiable value of imported merchandise by a Customs official who follows procedures outlined in their country's tariff, such as the U.S. Tariff Act of 1930.

Air pressure

The frame of a container constructed to hold one or more thermally insulated tanks for liquids.

To unload a shipping container.

Usually refers to a rating that applies to an article regardless of size or quantity.

A line that controls the angle of the sail in its relation to the wind; attached to the clew of a sail to adjust its trim (make the sail the proper shape to catch the wind).

Electro-mechanical steering device; an instrument designed to control automatically a vessel's steering gear so that she follows a pre-determined track through the water.

A short period at the turn of the tide. The time between flood and ebb tides when there is no current flow.

Originally meant "to stow cargo". Now, means "to search a ship carefully and thoroughly".

A stated amount over a fixed rate to one point to make a rate to another point.

A large, flat bottomed boat used to carry the mud from a dredge.

An attachment point for another object.

Line on a chart linking points of equal depth. also known as a Depth Contour.

Said of a distant ship when her hull is below horizon and her masts and upper works are visible.

A device invented by Captain Jacques Cousteau in 1943 to enable a diver to operate underwater independent from an air supply from the surface.

The difference in depth between high and low tide.

Covered tunnels within a ship through which the tail shafts pass.

A person or firm who transacts all business in a port on behalf of shipowners or charterers. Also called shipping agent; agent.

Running a compressed air system at a higher than needed pressure.

A traditional maritime saying to indicate that it is time for a morning drink, it was generally assumed that in northern latitudes the sun would show above the foreyard of a ship by 11.00 which was approximately the time in many ships of the forenoon "sta ...