GMDSS divides the world’s oceans into four “sea areas”, designated A1 through A4.
AREA A1:-
An area within the radiotelephone coverage of at least one VHF coast station in continuous digital selective calling (DSC), alerting is available.
Area could extend up to 30-50 Nautical Miles.
AREA A2:-
An area within the radiotelephone coverage of at least one MF coast station in which continuous DSC alerting is available.
Area could extend up to 200 nautical miles.
AREA A3 :-
An area, excluding area A1 and A2 within coverage of an Inmarsat geostationary satellite in which continuous alerting is available.
Range – Between latitude (76 degree N to 76 degree S)
IMO requirements for Range :(70 degree N to 70 degree S)
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