DING HENG 36 recent position and historical past of port calls are acquired by AIS. Complex technical specs, tonnages and management information are derived from VesselFinder databases.??? ???? ???? ????? ?????? ??? ?? ??? ??? ??? “??? ???? ????”??? ???? ??? ????????? ??? ??? ???? ??? ??? ???? ????? ??? ????? ????? ?????? ??? “????? ??????? ?