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Glossary term Description
MDO

Marine diesel oil. A grade of bunkers

mayday

A distress message.

maximum cargo height Frozen goods are packed using the block stowage method merely for protection against the effects of external heat, so it must be ensured that subzero temperatures are maintained in the floor, side and ceiling areas. A free space of at least 8 -10 cm must be left for the return air between the top of the cargo block and the container roof. This maximum cargo height is indicated in the containers.
master

Is appointed to command a merchant vessel

MARS

(Nautical Institute) Marine Accident Reporting Scheme

MARPOL

IMO convention on marine pollution

MARAD

 US Maritime Administration, an agency within the US Department of Transportation

manifold On a tanker, the interface between the shore pipeline connection and the tanker's pipeline system. Usually measured in inches of diameter. See PLEM