GD0054 SOUTH CHINA SEA WRECK “MEI HANG 839” VIRTUAL AIS BUOY ESTABLISHED IN POSN 21°03′18″N 111°15′30″E ON 18 APR. SHOW：MEI HANG 839 WRECK MMSI：994136682 SELF-SERVICE WORKING MODE CAUTION ADVISED GUANGDONG MSA CHINA
