Footnote
Clasification Society 2024 - Version 9.40

Footnote

Parent topic: Footnotes

Sea Area A1 is defined by the ability of the vessel to make a VHF DSC distress alert to a coast station. The range of VHF communications depends upon antenna height and transmitted power. The extent of A1 describe in ALRS and others is based upon the vessel having a 25W fixed VHF DSC radio installation and an antenna 4m above sea level. The range is likely to be less for a portable radio or an antenna <4m above sea level. It is up to the vessel to ensure that the VHF distress alert to a coast station is continuously available. A vessel may be 3 nm from shore, but 20nm from the coast station receiving antenna.
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