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M

m

Metre. Unit of length.

Maritime Safety Information (MSI)

Distress Alerts, navigational warnings, meteorological warnings and forecasts and other important safety information for ships.

MASTREP

Modernised Australian Ship Tracking and Reporting System (replaces AUSREP).

MCS

Maritime Communications Station. Another term for a coast station.

MES

A Mobile Earth Station in the Inmarsat system, which includes mobile, land, ship and airborne Inmarsat terminals. On a ship it is more commonly referred to as a Ship Earth Station (SES).

METAREA

Meteorological Area: A meteorological service area with area limits similar to NAVAREA’s in the WWNWS.

MF

Medium Frequency (300 to 3 000 kHz).

MFAG

Medical and First Aid Guide. Part of the International Maritime Dangerous Goods Code.

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.


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