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.

The foremost sail; a triangular shaped foresail forward of the foremast.

A lit navigational aid such as a lighthouse that can be used at night or in poor visibility.

A small local current usually caused by tidal streams as they ebb and flow around or against obstructions.

Japanese tapered pipe thread (Female).

Abbreviation for "Not Otherwise Indexed."

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

An order to cease (stop).

A cleat designed to hold a line in place without slipping. It consists of two narrowing jaws with teeth in which the line is placed.

A charge made for lifting articles too heavy to be lifted by a ship's normal tackle.

A penalty charge against shippers or consignees for delaying the carrier's equipment beyond the allowed free time. The free time and demurrage charges are set forth in the charter party or freight tariff.- See also Detention and Per Diem.

The number of degrees of list a vessel has. The first indication that a vessel may need to reef is when there is too great an angle of heel.

A means of purifying an air stream by using both gravitational and centrifugal forces.

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.

The length of the boat at the waterline.

The top point of the line about which the earth rotates.

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

To store a yacht away on land for the winter

After or trailing edge of a sail; the after edge of a fore-and-aft sail and the outer edges of a square sail.

At a considerable distance.