GMDSS Sea Area A4
Abbreviation: Area A4
The polar sea areas beyond GMDSS Area A3, not covered by geostationary satellites, where HF radio is used for distress alerting.
Related
Source: SOLAS Chapter IV
Abbreviation: Area A4
The polar sea areas beyond GMDSS Area A3, not covered by geostationary satellites, where HF radio is used for distress alerting.
Source: SOLAS Chapter IV