A bollard with horizontal arms, forming the shape of a cross, as a means of belaying lines.

Scoop like devices used to direct air into and ventilate a boat.

The logic of binary systems, such as control systems in which all operations may be reduced to on-off, open-closed, or similar dichotomous basis.

Light-weight foresail similar to a spinnaker but set without a pole.

Port of initial Customs entry of a vessel to any country. Also known as First Port of Call.

A written contract between the owner of a vessel and the person desiring to employ the vessel (charterer); sets forth the terms of the arrangement such as duration of agreement, freight rate and ports involved in the trip.

Specially designed for the transport of chemicals.

A device that indicates pressure differential above or below atmospheric pressure.

Air or vapor given off or expelled as a byproduct or result of an operation or treatment process.

To temporarily stop all movement of a line through a block by placing the hauling part across the sheave of the block. This jams the sheave and holds it tight, and a pull on the hauling part will release it.

Flapping (of sails)

A power or sailing boat used by pi-lots (men who have local knowledge of navigation hazards of ports).

(1) The flag traditionally flown by pirate ships. (2) The name given by sailors to the bubonic plague, whose victims were said to turn black.

see Turnbuckle

The triangle formed by the masthead, the base of the mast at deck level, and the lower end of the headstay.

A metal fitting with an arm that uses a spring to close automatically when connected to another object.

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

Any rope or line.

A bend or hitch used to attach a line to a ring or spar so that by pulling the end of the line, the hitch will come free. This is done by passing a bight of the line under the other part so that when strain is applied the bight is jammed. A pull on the en ...

An apparatus consisting of an outside shell and a sheave through which a rope may be passed (pulley).