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.

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

Air pressure

(1) To lay a line out in coils so that it can run without fouling. (2) Folding a sail in layers on the boom.

The difference in depth between high and low tide.

Rum diluted with water. In the 1700s the daily ration of rum in the British Navy was diluted with water with the idea of reducing drunkenness. The term groggy was derived from the effects of drinking too much grog.

The anchor is under the hawse .

(1) To tip the boat over so that the boat is upside down with the mast pointing down to the sea bottom. (2) A bag in which a spinnaker or other large sail can be stowed with the lines attached so that it can be rapidly raised.

Chocks which hold and anchor in place either in a locker or on deck.

The ratio of the isothermal power consumption to shaft input.

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

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

A position based on estimations of a boat's position using estimated speed, currents, and the last known position/fix - of the boat.

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

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

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

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

To unload a shipping container.

The right to maintain a course according to the Rules of Navigation. When two boats are on intersecting courses, one is the "stand-on" vessel (has "right of way" and must hold its course steady) so the other "give-way" vessel may steer clear. ...

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