A watch tackle (small, handy block and tackle for general use).

Maintains and monitors radio, sends and receives messages. Often maintains electronic navigation. Latest replaced with certified GO (Deck officer)

In the days of tall ships the barometer was a glass vessel with a thin stem. The fluid in the glass (in most cases water) would move up and down the stem as the pressure of the surrounding atmosphere changed. These movements were used to predict changes i ...

Warehouse Withdrawal for Transportation Immediate Exportation.Allows merchandise that has been withdrawn from a bonded warehouse at one U.S. port to be exported from the same port exported without paying duty.

An absolute temperature scale. The kelvin unit of thermodynamic temperature, is the fraction 1/273,16 of the thermodynamic temperature of the triple point of water. The triple point of water is the equilibrium temperature (0,01

The ability of a fluid that is insoluble in water to separate from water with which it may be mixed in the form of an emulsion.

Annual publication of astronomical data for the use of navigators.

A lubricating oil made with synthetic base stocks.

(1) A body of salt water. A very large body of fresh water. (2) The condition of the water around a boat. Heavy seas for example.

The increase in pressure in the discharge header that develops as a result of flow after the pressure relief device opens

To untie.

Said of a vessel when stopped and lying near the wind in heavy weather. See Heave To

A sliding type of bearing having either rotating or oscillatory motion and in conjunction with which a journal operates. In a full or sleeve type bearing, the bearing surface is 360 degrees in extent. In a partial bearing, the bearing surface is less than ...

To come alongside.

Anti-clockwise circular motion. Left-handed ropes are coiled down in this way.

Nautical name for an anchor. Originally, was a stone used as an anchor.

Wind that is deflected from it's normal course by the sails

A wooden bar which may be shipped in the capstan head for heaving around by hand (to heave up anchor or heavy objects by manpower).

A spring line from the stern of a boat to mid ships to stop forward movement

The person who is in charge of a vessel and legally responsible for it and its occupants.