To keep a weather eye is to be on the alert (heads up).

Is the property of a substance that gauges the potential or driving force for the flow of heat.

Small staysail located between the foremast and mainmast.

Metal strip and lead fastener used for locking freight car or truck doors. Seals are numbered for record purposes.

The fitting which connects the boom to the mast.

The swiveled opening at the top of a ventilator.

A manmade waterway used to connect bodies of water that do not connect naturally. Canals use locks to raise and lower boats when connecting bodies of water that have different water levels.

Abbreviation for "Not Otherwise Indexed."

(1) A wind shift further forward relative to the boats direction or heading. (2) A bar or angle under a deck the same size as deck beams. It is used around stair openings in deck, small hatch openings, or at dead end of longitudinals.

Owners or operators of vessels providing transportation to shippers. The term is also used to refer to the vessels.

Said of wind when exactly ahead; and of another vessel when her fore and aft line coincides with observer's line of sight.

Said of a vessel when she is shipping water on deck and it is running off through scuppers and freeing ports.

Assault upon a seaman, by Master, while at sea.

Seaman's term for the period of work on board ship for which he has been paid in advance when signing on.

A keel that is narrow and deeper than a full keel.

The permitted increase in pressure developed after the valve has opened. Usually expressed in percentage, ie.; 3% accumulation (A.S.M.E. Code, Section I). Flows through safety/relief valves are officially determined at these overpressure conditions.

That part of a ship's bow where the hawse holes and hawse pipes are situated.

A coupling pin centered on the front underside of a chassis; couples to the tractor.

A container designed with openings in the side and/or end walls to permit the ingress of outside air when the doors are closed.

Forty Foot Equivalent Units (Containers).