In general, a person employed in a sea-going vessel. In some cases, applied to a seaman who works on deck.

Narrow triangular sail set on a long yard or spar, the forward end of which is hauled down so that it sets obliquely on the mast with a high peak.

Magnetic variation. The difference, east or west, between magnetic north and true north, measured as an angle. Magnetic variation varies in different geographic locations.

Machines cooled by water circulated through jackets surrounding the cylinders or casings.

A float with a flag at the top of a pole. Used to mark a position such as for a mooring, a race or a man overboard.

Time saved, reward for quick turnaround in dry cargo only.

An agreement to hold a carrier harmless with regard to a liability.

To reeve and secure a stopper (hold a strain on a line while transferring it).

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

A drogue or drag device to slow down a boat, hold its bow into the sea in heavy weather, and reduce the boat's drift downwind.

Half of a sphere. On the globe hemispheres are used to describe the halves of the earth north or south of the equator.

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

An opening in a ship's side, provided with a glazed lid or cover for the admission of light.

Cloths hung on the lee side of a berth to keep one from rolling out of their bunk

Steel disc, that is dogged down over a porthole to secure against breakage of the glass and to prevent light from showing through.

Gross tonnage is the basis on which manning rules and safety regulations are applied, and registration fees are reckoned. Port fees are also often reckoned on the basis of GT and NT. GT and NT are defined according to formulas which take account, among ot ...

The relationship of flow per unit area to differential pressure across a filter medium.

Energy terms

The length of the boat at the waterline.

Master of a sea-going vessel. Certificated officer competent and qualified to be master of a sea-going vessel.