GMDSS系统船长遇险操作指南GMDSS operating guidance for masters of ships in distress situationsIS IMMEDIATE HELP NEEDED？EMBARK IN SURVIVAL CRAFT WITH VHF，SART AND IF POSSIBLE EPIRBSWITCH ON EPIRBANDSART IMMEDIATELYAND LEAVE ONIS VESSELSINKING OR TO BE ABANDONED？A POTENTIAL PROBLEM EXISTSTRANSMIT DISTRESS CALL BY HF/MF/VHS DSC OR INMARSATRESPONSERECEIVED？COMMUNICATE ONHF/MF/VHF OR INMARSATTO RCC AND SHIPSSWITCH ON EPIRB AND SART MANUALLY ON BOARDNOTIFY RCC BYHF/MF/VHF DSC ORINMARSATRESPONSERECEIVED？COMMUNICATE ONHF/NF/VHF ORINMARSATTO RCC AND SHIPSTRANSMIT DISTRESSCALL BY HF/MF/VHF DSC OR INMARSAT 和 YES NO NO YES NOYES NOYESYES