A.船對岸、岸對船遇險報警 B.船對船的遇險報警 C.遇險通信 D.電傳通信 E.選擇性呼叫 F.區(qū)呼
A.0240UTC B.0640UTC C.1040UTC D.1440UTC E.1840UTC F.2240UTC
A.SES B.CES C.NCC D.RCC E.SAT F.NCS