Long Ton = 1016.05 kilogram

A white light, usually on the masthead, visible from all directions, used to indicate that a vessel is anchored.

When an anchored vessel is forced, by wind or current, to swing across her anchor so as to risk fouling it with her own cable, she is said to break sheer.

A small boat with the mast stepped far forward, carrying a single sail

Nautical Flag meanings can be found here.

A language of "dots" and "dashes" used to send messages, either sound using radio waves, or light using a searchlight or Aldis lamp.

A harbor restriction placed on a ship which has an infectious disease on board, or which has arrived from a country where such a disease is prevalent. The crew may not go ashore until the ship is granted pratique.

An occasional sprinkling dashed from the top of a wave by the wind, or by its striking an object.

Confined to an anchorage or haven through being unable to proceed because of stormy weather.

The horsepower required to isothermally compress the air or gas delivered by the compressor at specified conditions.

GMT for short. Greenwich Meridian Time, also known as Universal Time or Zulu time. A time standard that is not affected by time zones or seasons. It is the time used by navigators in celestial navigation.

(1) Floating, but at mercy of wind and sea. (2) Piercing the hull with a projectile. (3) Taking in sail during a calm.

A point of sail where the boat is sailing away from the wind, but not directly downwind; Sailing with the wind coming from any direction from abeam to on the quarter, with the bow approximately 135 degrees to the wind source and the sails let out nearly a ...

A line leading forward from the end of a mainsail boom to prevent the boom from swinging inboard while broad reaching or running. also Preventer

A sea with waves approaching from the stern of the boat; a sea in which the waves are moving in the same direction as the vessel

The naval architect's drawings of a ship showing the various sections.

Pull the sail in by pulling on the sheet.

To subject petroleum oil to heat for breaking down into lighter products.

Pieces of ice, about the size of a small house, that have broken off a glacier.

(1) A round eye through which a line is led, usually in order to change the direction of pull. (2) A thick piece of glass set flush in the deck to admit light below.