On a square-rigged ship, a light weather sail set next above the royal in fair weather.

The operation of secretly bringing goods into a country to avoid paying duty on the goods. Also applies to illicit goods.

The stationary seating surface, the inlet of a valve.

In sailboat racing, a tactical maneuver to lock in a competitor by tacking on them in close proximity so they can not tack from under your boat and they start to lose speed due to your sails blocking their sails.

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

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

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.

The location from which the boat is steered, usually in the middle or at the stern of the boat.

Another term for a marine railway.

The imaginary line running from bow to stern along the middle of the boat.

Any rope or line.

A set of radio, sound, and visual signals designed to aid in communications between vessels without language problems. It can be used with Morse Code, with signal pennants, and by spoken code letters.

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.

Starboard.

block

Steel section running along the length of each bottom edge of a shipping container giving its structural strength.

Small struts or spars extending toward the sides from one or more places along the mast. The shrouds cross the end of the spreaders, enabling the shrouds to better support the mast. Also known as crosstrees in older vessels.

Placing a container where required to be loaded or unloaded.

An anchor which has become entangled with some object on the bottom, or, on weighing, has it's rode or chain wound around its stock or flukes.

A structure of heavy timbers placed between ground ways and cradle to support the ship during launching.