GMDSS defines four sea areas based upon the location and capability of onshore-based communication facilities. The definition of the Sea Areas for GMDSS is outlined below.
Sea Area A1
The radiotelephone coverage of VHF coast stations in which continuous alerting by Digital Selective Calling (DSC) is available.
Sea Area A2
The radiotelephone coverage of MF coast stations in which continuous alerting by Digital Selective Calling is available.
Sea Area A3
The coverage of Inmarsat geostationary satellites.
Sea Area A4
Area outside A1, A2 and A3, mostly sea area around polar regions
Please contact us for further information