In maritime warfare, a declaration published by a power forbidding sea-borne trade with an enemy.

The watches aboard ship change at 4, 8, and 12 around the clock. A watch lasts four hours and at each half hour during the watch, a bell is struck. For instance, at 12:30 a.m. there is one bell for the first half hour after midnight; at 1:00 a.m. there ar ...

The anti-corrosive paint used on and above the waterline.

Small line consisting of several loosely twisted yarns.

A common measurement of the internal volume of a ship with certain spaces excluded. One ton equals 100 cubic feet; the total of all the enclosed spaces within a ship expressed in tons each of which is equivalent to 100 cubic feet.

Shapes such as angle bars or stringers welded to a surface such as a plated bulkhead to increase rigidity.

Once the only method, other than human voice, of passing orders to men on board ship; the instructions to perform certain tasks were conveyed by different notes and pitches on the high-pitched whistle.

The line of longitude 180 degrees opposite Greenwich, England, located in the Pacific that marks the date change

Amends the Act of 1984 to provide for confidential service contracts and other items.

C The international temperature scale where water freezes at 0 (degrees) and boils at 100 (degrees). Also known as the centigrade scale.

The difference in pressure between any two points of a system or component.

A line drawn on a chart, as a result of a bearing, along which the boat is positioned

To put out a mooring, hawser or line from a ship to a point of attachment outside her.

Seller is responsible for goods and preparation of export documentation until actually placed aboard the vessel.

The mount and housing for the compass, usually located on the wheel's pedestal.

A low vertical lip or raised section around the edge of a cockpit, hatch, etc. to prevent water on deck from running below.

Abnormal, rapid reciprocating movement of the disc on the seat of a pressure relief valve.

A long sturdy pole fitted with a blunt hook at one end designed to catch a line when coming alongside a pier or mooring, to facilitate putting a line over a piling, recovering an object dropped overboard, or in pushing or fending off.

The North Star; visible in the northern hemisphere and indicates the direction of north. In the southern hemisphere the Southern Cross is used to find the direction of south.

On a square-rigged ship, the yards are square by the braces when they are at right angles to the fore-and-aft lines of the ship.