A threaded, adjustable fitting, used for stays, lifelines and sometimes other rigging. It is used to to maintain correct tension on standing rigging. Can also be used to pull objects together.

Inlet butterfly valve. These are fitted on the inlet of most types of compressor and the valve opens and closes to throttle the air flow. However, the term IBV is usually associated with turbo compressors.

For gauging purposes a transverse section including all longitudinal members such as plating, longitudinals and girders at the deck, side, bottom, inner bottom and longitudinal buklheads.

The ratio in percentage of the time that the equipment is in operation to the total working time.

An electronic communications or direction finding system which uses Very High Frequency radio waves. VHF radios are the most common communications radio carried on boats, but their range is usually limited to line of sight between the transmitting and rec ...

The line that controls the angle of the mainsail in its relation to the wind.

On the lee side of an object, protected from the wind.

Overhanging part of a vessel's stern. The area of the upper deck of a ship that is nearest the stern.

A region of shallow water usually made of sand or mud, usually running parallel to the shore. Bars are caused by wave and current action, and may not be shown on a chart

U.S. classification society which certifies seagoing vessels for compliance to standardized rules regarding construction and maintenance.

A short oar. To scull, is to impel a boat by one oar at the stern.

A loop or hole which is spliced or tied on the end of a line

A component on a compressed air line that provides wide are coverage with a thin sheet of air. Also amplifies compressed air flow, reduces noise. Used in blowing, cooling. Also known as air knife.

The total price to move cargo from origin to destination, inclusive of all charges.

A short strut on a mast angled forward at about 45

On square-rigged ships, a form of ceremonial salute to honor the visit of a high official. The yards were lined by men standing upon them, and there was also a man standing on the truck of each topgallant mast.

The vertical barrel device used to heave in cable or lines.

Said of a line that leads from its point of attachment towards the stern of the ship.

A light showing an unbroken light over an arc of the horizon of 360 degrees. An anchor or riding light is an all-round light.

Navy term meaning Officer of the deck.