A.DISTRESS ALTER B.URGENT CALL C.DISTRESS RELAY D.SAFETY CALL
A.1.6HZ衛(wèi)星示位標 B.406MHZ衛(wèi)星示位標 C.VHF緊急示位標 D.A或B都可以
A.PANPAN B.PANPAN三次 C.XXX D.XXX三次