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Encyclopedia of Marine Technology


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Maritime inquiry

An inquiry conducted by maritime and legal authorities following an accident or near-accident at sea, resulting in a maritime declaration. The purpose of such hearings is to discover the cause of accident or mishap.

Maritime Safety Committee (MSC)

The most senior of the technical committees of the International Maritime Organization.

Maritime safety information

Navigational and meteorological warnings, meteorogical forecasts and other urgent safety-related messages broadcast to ships, (SOLAS, Chapter IV).

Mark III system

Technigaz Mark III LNG cargo containment system incorporates a 1.2mmthick waffled 304L stainless steel membrane supported by load-bearing insulation.

MARPOL 73/78

The MARPOL Convention is the main international convention covering prevention of pollution of the marine environment by ships from operational or accidental causes.

MARPOL 73/78 Annex I, Regulations for the Prevention of Pollution by Oil

Annex I (Oil) came into force on 02.10.1983 and contains conditions for discharge of mixtures containing oil and also requirements applicable to the construction and equipment of tankers larger than 150GRT and other ships larger than 400GRT.

MARPOL 73/78 Annex II, Regulations for the Control of Pollution by Noxious Liquid Substances in Bulk

Annex II came into force on 06.04.1987 and contains discharge conditions for four categories of noxious substances and requirements applicable to the construction and equipment of ships carrying such substances.

MARPOL 73/78 Annex III, Prevention of Pollution by Harmful Substances Carried by Sea in Packaged Form

Roughly 15% of goods carried as cargo are dangerous goods.

MARPOL 73/78 Annex IV, Prevention of Pollution by Sewage from Ships

The regulations contain requirements for surveys and certification of sewage systems and impose operational restrictions regarding sewage discharge. Annex IV entered into force on the 27 September 2003.

MARPOL 73/78 Annex V, Prevention of Pollution by Garbage from Ships

Annex V, which came into force on 31.12.1988, contains requirements relating to the disposal of all types of food, household and operational waste that have accumulated aboard ships during operation.

MARPOL 73/78 Annex VI, Prevention of Air Pollution from Ships

Annex VI, which came into force on 19 May 2005, governs the control of the discharge of noxious substances from ship diesels. It is applicable to ship diesels with a power larger than 130kW built and installed since 1 st January 2000.


MARSEC means Maritime Security as used by the U.S. Coast Guard to designate security levels.


The maximum allowable relief valve setting of a cargo tank, (IGC Code).

Mass disease

An illness preferably of an infectious nature affecting more than two persons on board at the same time.


A tubular steel erection, which carries various items of navigational equipment and fittings, e.g. lights, radar, etc.

Master controller

A controller, which is used in a cascade control system. It provides an output which acts as a variable desired value for a slave controller.

Maximum ahead service speed

The greatest speed the ship is designed to maintain in service at sea at the deepest seagoing draught, (acc. to SOLAS, Chapter II-1, Part A).

Maximum allowable working pressure of a piping system

The maximum pressure of a piping system determined, in general, by the weakest piping component in the system or by the relief valve setting. The maximum allowable working pressure is not to exceed the design pressure.

Maximum continuous rating (MCR) of engine

The maximum continuous rated power output as specified on the nameplate and in the Technical File of the marine diesel engine.


A radio distress call.

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