The process of plotting a theoretical position or future position based on advancing from a known position using speed, time, and course, without aid of objects on land, of sights, etc. Term comes from deduced reckoning, abbreviated first to "ded reckonin ...

A device for furnishing fresh air to compartments below deck or exhausting foul air. Construction designed to lead air below decks. May have a cowl, which can be angled into or away from the wind; and may be constructed with baffles, so that water is not ...

1,000 board feet. One MBM equals 2,265 C.M.

A metal air-tight tank built into a boat to insure flotation even when the boat is swamped.

Is one which 1) handles a small constant flow of liquid with the gas; 2) utilizes evaporative (injection) cooling; or 3) circulates a liquid for sealing and/or cooling. The last may or may not be evaporative cooling.

The Captain of a vessel. Highest officer aboard ship. Oversees all ship operations. Keeps ships records. Handles accounting and bookkeeping. Takes command of vessel in inclement weather and in crowded or narrow waters. Handles communications.

An opening such as a hole or vent. An opening through which air can pass, or a restricted opening placed in a pipe line to provide a means of controlling or measuring flow.

A rope spliced into the end of a block and used for making it fast to rigging or spars. Such a block is called a tail-block.

Reciprocating type compressor used mainly in oil and gas field applications. The compressor cylinders operate at low compression ratios and experience small temperature rise.

A unit of electrical current or rate of flow of electrons through a conductor. One volt across one ohm of resistance causes a current flow of one ampere. One ampere is equal to 6.25 x 1018 electrons per second passing a set point in a circuit.

A sprocket wheel on the windlass for taking links of the chain cable.

A grooved metal extrusion fitted on a forestay and used to secure the luff of a sail by holding its bolt rope in place.

To charge less than the proper amount.

The ability of a boat to keep from being moved sideways by the wind. Keels, daggerboards, centerboards, and leeboards are all used to improve a boat's lateral resistance.

A call requesting direction in answer to the report of a lookout that an object has been sighted.

Transportation charge advanced by one carrier to another to be collected by the later carrier from the consignor or consignee.

When all the sails are shaking.

Cargo thrown overboard in order to lighten the ship and washed ashore.

A method of docking with a boat's stern to the dock.

A distinctive fixed reference point that can be used for navigation.