A term for the captain, a holdover from the days when the captain was literally, and legally, the "master" of the ship and crew. His word was law.

U.S. Customs' automated program under AMS. It allows for electronic reporting of inbound (foreign) cargoes in the U.S.

The top of a mast.

The top part of the mast.

Also known as a steaming light. The masthead light is a white light that is visible for an arc extending across the forward 225

The white running light carried by steam vessel underway on the foremast or in the forepart of the vessel.

A design in which the forestay runs to the top of the mast.

An archaic practice. An acknowledgement of cargo receipt signed by a mate of the vessel. The possessor of the mate's receipt is entitled to the bill of lading, in exchange for that receipt.

Receipt made by Chief Officer, stating the quantity and condition of goods loaded.

Maximum allowable working pressure. This data is found on the pressure vessel nameplate and is the maximum pressure at which the lowest set safety valve must be set (stamped).

The highest operating pressure the system or component is designed to withstand.

The oily condensate discharged by lubricated air compressors. The name is derived from the appearance of the condensate. Under normal conditions oily condensate should just be cloudy, like a small amount of milk in a bucket of water. When a lubricated com ...

1,000 board feet. One MBM equals 2,265 C.M.

Abbreviation for "Master Container Freight Station." See CFS.

Marine diesel oil

A figure representing the average low tide of a region.

A course marked by buoys or ranges measuring one nautical mile. Measured miles are used to calibrate logs.

Freight on which transportation charges are calculated on the basis of volume measurement.

40 cubic feet.

The ratio of the indicated power to shaft input.