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 1
- The radiotelephone coverage of VHF coast stations in which continuous alerting by Digital Selective Calling (DSC) is available.
- Sea Area 2
- The radiotelephone coverage of MF coast stations in which continuous alerting by Digital Selective Calling is available.
- Sea Area 3 (All HMM & HMS fleet)
- The coverage of Inmarsat geostationary satellites.
- Sea Area 4
- Area outside A1, A2 and A3, mostly sea area around polar regions.
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