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M/T Metric tons (2,250 lbs.).
M/V Motor Vessel / Merchant Vessel
MAIB Marine Accident Investigation Branch
MAIIF Marine Accident Investigators' International Forum
MAIN DECK The main continuous deck of a ship running from fore to aft; the principle deck; the deck from which the freeboard is determined.
Mainsheet the line that controls the boom
Manifest Inventory of cargo onboard
MANIFEST A document containing a full list of the ship's cargo, extracted from the bills of lading.
MANNING SCALES the minimum number of officers and crew members that can be engaged on a ship to be considered as sufficient hands with practical ability to meet every possible eventuality at sea.
Marisat maritime satellite system
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MARITIME ADMINISTRATION (MARAD ) Oversees subsidy programs to the United States Merchant Marine. Assigns routes to subsidized liners.
MARITIME LIEN A claim which attaches to the res, i.e., the ship,. freight, or cargo.
MARITIME SUBSIDY BOARD (MSB) A branch within the Maritime Administration which deals with Operating Differential Subsidy and Construction Differential Subsidy.
MARLINSPIKE a tool for opening the strands of a rope while splicing.
MARPOL 73/78 The International Convention for the Prevention of Pollution from Ships, 1973, as modified by the Protocol of 1978.
MASTER (CAPTAIN) Highest officer aboard ship. Oversees all ship operations. Keeps ships records. Handles accounting and bookkeeping. Takes command of vessel in inclement weather and in crowded or narrow waters. Handles communications. Receives and implements instructions from home office.
MASTHEAD LIGHT a white light positioned Over the fore and aft centerline of the vessel.
Mb megabyte
MB Merchant Broker
MCA Marine Coastguard Agency
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MDO (DO) Marine Diesel Oil
MEO medium earth orbit (satellite configuration)
MEPC Marine Environment Protection Committee, IMO
MERSAR Merchant Ship Search and Rescue Manual
MFN Most Favored Nation.
MGN Marine Guidance Note
MGO Marine Gas Oil
MIB Marine Index Bureau.
MICROBRIDGE A system of through rates and service offered by a carrier for cargo shipments from any inland U.S. location to a port, by sea to a foreign port and finally overland to foreign inland destination.
MIDSHIP Approximately in the location equally distant from the bow and stern.
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MIN/MAX Minimum/Maximum (cargo quantity)
MINILAND BRIDGE the process of taking inland cargo bound for Export to the coast by rail and loading it Directly to the ship.
MIRAID Maritime Institute for Research and Industrial Development.
MIS management information system
MIXED SHIPMENT a shipment consisting of More than one Commodity, articles described under More than one class or Commodity rate item in a tariff.
Mizzen the shorter mast behind the main mast on a ketch or yawl
MNI Member of The Nautical Institute
MOA Memorandum of Agreement
MODU Mobile Offshore Drilling Unit.
MOLCHOPT More or Less Charterers Option
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MOLOO More or Less Owners Option
Mooring an anchor or weight, permanently attached to the sea floor, with a buoy going to the surface, used to hold the boat in a certain area
MOORING LINE a cable or line to tie up a ship.
MOP mobile offshore production
Mortgage Loan issued against some security
MOU memorandum of understanding (often refers to PSC)
MRCC maritime rescue coordination centre
MSB Maritime Subsidy board.
MSC Marine Safety Committee, IMO
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MSN merchant shipping notice 'M- Notice',UK
MT Mertic Tonne (i.e. 1,000 kilos)
MTC Maritime Transport Committee, OECD
MULTIPURPOSE SHIP any ship capable of carrying different types of cargo which require different methods of handling. there are several types of ships falling into this category, for example, ships which can carry roll on/roll off cargo together with containers.
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