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 compressor cooled by atmospheric air circulated around the cylinders or casing.

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.

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 ...

A timber or rib of a ship running from the keel to the side rail; the transverse strengthening members in a ship's hull that extend from the keel to the deck or gunwale. The frames form the shape of the hull and act as a skeleton on which the hull plankin ...

Is a measure of the rate of change of viscosity with temperature. Oils with high VI have low viscosity changes.

On square-rigged ships, the lines which are lead from the masthead to the ends of the yards to support them.

The order in which compressors are brought online.

The framework of timber, etc., on which a vessel is built, from which she is launched into the water.

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

An annual publication that contains tidal information and information about the position of the sun, moon, planets and stars. This information is used for celestial navigation.

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 distinctive fixed reference point that can be used for navigation.

To remove from a ship. To remove an item from its place.

Abbreviation for "Not Elsewhere Specified."

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

Fixed ports that do not open which are placed in the deck or cabin to admit light.

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.

Little or no wind and flat seas

An industry abbreviation for "Hazardous Material."