Operation mode of a communication circuit in which each end can transmit and receive, but not simultaneously.

The water portion of the earth as distinguished from the solid part, called the lithosphere, and from the gaseous outer envelope, called the atmosphere.

The forward part of a vessel's sides (front).

The national ensign.

Freedom of movement.

This is the average level of the ocean over the entire earth., tidal fluctuation is taken into account when determining sea level.

Construction-Differential Subsidy (46 USC Title V)

Health, Safety and Environmental Group (U.K.)

Marine Environmental Protection Committee (IMO)

Twin Screw

Hazardous Material

An essential document for officers and seamen as it serves an official certificate confirming sea experience in the employment for which he was engaged. DOD - Department of Defense.

Accommodations. Living Ccompartments

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.

Generally, the relative states of inflow, outflow, and storage of moisture over a given area of earth's surface.

A member or members of the crew that keep watch and check to see whether the anchor is dragging and the the drift of the ship. This is prudent when anchored in heavy weather, or where wind direction may change dangerously.

A document certifying that merchandise (such as of Inspection perishable goods) was in good condition immediately prior to its shipment.- The document issued by the U.S. Coast Guard certifying an American flag vessel's compliance with applicable laws and ...

Vessel used for transporting coal.

The seaman's term for one who does not go to sea.

A term for the captain, a holdover from the days when the captain was literally, and legally, the "master" of the ship and crew. His word was law.