Lines on the Earths surface joining point where there is no magnetic variation.

An instrument used to keep a record of atmospheric pressure, such as on a paper drum.

Line 12 inches or 300 mm long, painted amidships on both sides and parallel to the load lines.

To let the sheet out slowly while maintaining control.

Term for a seaman's short leave from his ship, permitting him to go ashore for the day or night.

A component on a compressed air line designed to increase in magnitude the flow by releasing small amounts of compressed air at high velocity through an internal, ring shaped nozzle. This column of air released through the front creates a vacuum behind, t ...

Space between the floor of holds and the bottom of the ship.

Generally speaking the word amidships means in the middle portion of a vessel.

A navigation instrument used to measure the apparent height of a landmark whose actual height is known, such as the top of a lighthouse. From this information, the ship's distance from that landmark can be calculated.

Can occur any time warm, moist air blows over a surface cool enough to drop it's temperature below the dew point.

A light line with a weight on the end used for heaving from ship to shore (or ship to ship) when coming alongside. A heavier cable or hawser is attached which can then be hauled over using the heaving line.

One of the 3 possible distances:The max height from the water line to the topmost of a ship,The clearance between the topmost point and a bridge over a river,The max height from the water line to the top of the hatch coamings.

Fitted with cabins and catering facilities for offshore crews. Semisubmersible accommodation units are ofte called "Flotels".

To sail large, with wind about four points abaft beam.

A device for drying compressed air by means of condensation obtained by over-compression or cooling, absorption, adsorption or a combination of the above methods.

To combine or charge with gas.

A place not suitable for anchoring.

When the draft of a ship fore and aft are the same. Floating level (no list).

Practice of loading iron ore cargoes into every alternate hold, leaving the remaining holds empty.

To cast overboard or off. To discard something as unwanted or burdensome. Goods or equipment may be jettisoned to lighten a ship in danger.