Passenger ships of any gross tonnage and cargo ships of 300 GT or more must carry a person or persons qualified for distress and safety radio communication purposes. On Area A1 ships the person qualified must hold at least a GMDSS Restricted Operator Certificate (ROC). On Area A2, Area A3 and Area A4 ships the person qualified must hold at least a GMDSS General Operator's Certificate (GOC).
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