A bunk which runs under the cockpit

1,728 cubic inches. A volume contained in a space measuring one foot high, one foot wide and one foot long.

A sleeping berth or bed.

Ice in an area containing several small pieces of floating ice, but with total water area exceeding total area of ice.

During the operation of tacking, the moment when a sailing vessel is head to the wind and hanging there, with her head not paying off on the opposite tack. Such a vessel is said to be "in stays" or "in irons".

Occurs whenever the system undergoes either a change in state or an energy transfer at a steady stare.

A port free of customs duty and most customs regulations.

A unit used to measure the barometric pressure of the atmosphere. 1 millibar equals 0.03 inches of mercury.

A person in command of a ship. A person certified as competent to command a ship. A master mariner.

The actual work required to compress and deliver a given gas quantity, including all thermodynamic, leakage and fluid friction losses. It does not include mechanical losses.

A liquid piston compressor is a rotary compressor in which a vaned rotor revolves in an elliptical casing, with the rotor spaces sealed by a ring of liquid rotating with it inside the casing.

A two-masted vessel with both masts square rigged. On the sternmost mast, the main mast, there is also a gaff sail

The acting of one person on behalf of another; a document authorizing one person to act on behalf of another.

A book with a record of every occurrence and incident concerning the ship.

A slang name for a bullying officer on a ship.

The space between any decks.

(1) Floating, but at mercy of wind and sea. (2) Piercing the hull with a projectile. (3) Taking in sail during a calm.

A language of "dots" and "dashes" used to send messages, either sound using radio waves, or light using a searchlight or Aldis lamp.

A small multi-pronged anchor used on dinghies and small boats. Also used to drag along the bottom to recover something that has sunk.