Metre. Unit of length.
Maritime Safety Information (MSI)
Distress Alerts, navigational warnings, meteorological warnings and forecasts and other important safety information for ships.
Modernised Australian Ship Tracking and Reporting System (replaces AUSREP).
Maritime Communications Station. Another term for a coast station.
Medium Frequency (300 to 3 000 kHz).
Medical and First Aid Guide. Part of the International Maritime Dangerous Goods Code.
Megahertz (1 000 000 hertz). A measurement unit of radio frequency, oscillation and vibration, equaling 1 000 000 cycles per second.