Equipment duplication area A3

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Equipment to be duplicated for area A3 vessels

GMDSS ships operating in A3 areas are required to provide the following duplicated equipment;

Two complete VHF installations (including DSC), and either;
Two complete Inmarsat C systems and one MF radio system, or;
One complete Inmarsat C system and one complete MF/HF radio system (including a scanning DSC receiver and NBDP equipment).

Many GMDSS ships opt for the latter option (1 Inmarsat C and one MF/HF DSC system), on cost grounds. Unfortunately, this has proven to be one of the underlying causes of the present extremely high false alerting rate on some GMDSS systems.