GMDSS - Sea Area Coverage Check
GMDSS sea-area (A1 / A2 / A3 / A4) determination from voyage distance from coast - drives radio-equipment carriage.
Sea area
A2 (MF + A1)
Formula, assumptions, and limits
A1: VHF DSC coastal (25 nm). A2: MF DSC (150 nm). A3: INMARSAT coverage (70°N to 70°S). A4: Polar (no INMARSAT) - HF DSC mandatory + Iridium encouraged.
Symbol legend
| Symbol | Meaning | Unit | Source |
|---|---|---|---|
| GMDSS sea area | - | SOLAS IV Reg. 2 |