An auxiliary volume that may be opened to the clearance space for increasing the clearance, usually temporarily, to reduce the volumetric efficiency of the compressor.

Speed through the water, not "over ground".

National flag or insignia flown by a ship at sea.

Convention on International Regulations for Preventing Collisions at Sea.

The condition of the tide when there is no horizontal motion.

The whole crew of a ship.

Air under pressure greater than that of the atmosphere.

A small double-pronged bendable pin used to secure a clevis pin or to keep turnbuckles from unwinding.

Abbreviation for the Railway Service "Container On Flat Car."

To reduce the volume of, by or as if by pressure.

A pipe of large diameter, through which the chains pass into the chain lockers.

An oil-skin hat with broad rear brim.

A sail attached to the forestay as opposed to a jib which is attached to the headstay.

Said of an anchor when the cable is taut and vertical.

An extension of the keel for protection of propeller and rudder.

To communicate with a vessel in sight.

A precursor to the sextant. An old navigational device for checking the altitude of the sun or stars.

A sheet or halyard coiled so that it will run out quickly without becoming tangled.

The cabin roof, raised above the deck to provide headroom in the cabin. Also trunk.

A government official residing in a foreign country who represents the interests of her or his country and its nationals.