Sixteenth-century term for a sea distance at which high land could be observed from a ship. Varied between 14 and 22 miles according to average atmospheric conditions in a given area.

A loop shaped fitting attached to the deck, spar, boom, etc., used to secure a line or block to some part of the vessel.

United Nations EDI for Administration, Commerce and Transport. EDI Standards are developed and supported by the UN for electronic message (data) interchange on an international level.

To windward, in the direction of the eye of the wind; toward the wind; in the direction from which the wind is coming

A support fixed on the front part of a chassis (which is retractable); used to support the front end of a chassis when the tractor has been removed.

The degree to which all the forces on a boat are symmetrical so the vessel sails with just a slight weather helm.

A salt or ester of carbonic acid.

A solid wharf or structure built of stone along the edge of a harbor used for loading and offloading of cargo, and embarkation and disembarkation of passengers.

The air compressor continues to run, usually at full RPM, but no air is delivered because the inlet is either closed off or modified, not allowing inlet air to be trapped.

To untie.

A boat is double banked, when two oars, one opposite the other, are pulled by men seated on the same thwart.

Search of a vessel, by Customs authorities, for unreported goods.

Is used in psychrometry and is the temperature recorded by a thermometer whose bulb has been covered with a wetted wick and whirled on a sling psychrometer. Taken with the dry bulb, it permits determination of relative humidity of the atmosphere.

A small portable compass.

Rolling a vessel, that is slightly ice-bound, so as to break the surface ice around her. May sometimes be done when a vessel is lightly aground, but not ice-bound.

A hand held pneumatic tool. Designed for light demolition work, digging, making holes etc.

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

A law of chemistry and physics: the rate of diffusion of one substance in another is proportional to the negative gradient of the concentration of the first substance.

A fabric bag through which a gas stream is passed for the removal of particulate matter.

A small tapering flag, which can be used for identification or communication.