A compressor designed to compress air or gas without contaminating the flow with lubricating oil. Piston rings and packing are usually made of TFE-based materials or carbon or other synthetic material that operate without lubrication.

Unlit navigational aids for use during the day. They mark a bearing to a channel when they are lined up one above the other. Leading lights are lighted at night and serve the same purpose.

The difference between magnetic north and true north, measured as an angle. Magnetic variation is different in different geographic locations, so the nearest compass rose to each location on a chart must be used.

The opening up the back (aft) edge of the mast in which the mainsail luff rope slides when it is hoisted. Some masts have an external sail track.

A rate applicable from a point on one transportation line to a point on another line, made by agreement and published in a single tariff by all transportation lines over which the rate applies.

The after section of the propeller shaft.

An embargo imposed by a Government against another country.

Breaking away of a mass of ice from a glacier or iceberg.

The height of the decks, below decks.

Caulker's name for the seam in the upper deck planking next to a ship's waterways. There was very little space to get at this seam, making it a difficult and awkward job. This is the origin of the expression "Between the devil and the deep blue sea, since ...

A portable generator which can be attached to a refrigerated container to power the refrigeration unit during transit.

A very experienced and/or old sailor

Hard surfaced area of the quay on which shipping containers are assembled before loading.

40 cubic feet.

A small vessel fitted for towing.

A boat which uses the wind as its primary means of propulsion.

A slot into which the bolt rope or lugs in the luff of the sail are inserted to attach the sail.

A coupling device which consists of a spring loaded shutoff valve and a positive locking mechanism. It is used to connect tools, hoses and other accessories. Also known as Quick Disconnect.

Towards the center line of a ship (towards the center).

A ceremony performed on board ships when passengers or crew are crossing the equator for the first time during a voyage.