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M

MHz

Megahertz (1 000 000 hertz). A measurement unit of radio frequency, oscillation and vibration, equaling 1 000 000 cycles per second.

MID

Maritime Identification Digit. A 3 digit decimal number used as the first part of ship station identity (MMSI) to indicate nationality.

MKD

Minimum Keyboard and Display. A minimal text only display provided for AIS Class–A transceivers.

MMSI

Maritime Mobile Service Identity. The number used to identify coast stations’ and ships’ DSC, NBDP and AIS systems.

MPDS

Mobile Packet Data Service. An Inmarsat service allowing continuous connection of ships to terrestrial networks with payment for volume of data exchanged, rather than the duration of ‘airtime’ used.

MRCC

Maritime Rescue Coordination Centre. The Australian MRCC is located in Canberra and operated by AMSA (see also RCC and JRCC).

MROCP

Marine Radio Operator’s Certificate of Proficiency. Replaced by Long Range Operator Certificate of proficiency.

MROVCP

Marine Radio Operator’s VHF Certificate of Proficiency. Replaced by Short Range Operator Certificate of Proficiency.

MSC

Maritime Safety Committee of the IMO.

MSI

Maritime Safety Information. Navigational and meteorological warnings, meteorological forecasts and other urgent safety related messages.


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