Y1-03-0211 Rev D 937 Appendix7.1 Explanation of commonly used AbbreviationsAbbreviation Full TextA/B (A+B) AIS Channel 1 / AIS Channel 2ACK AcknowledgementAddrChM Addressed Channel ManagementAIS Automatic Identification SystemAIS_ChAs AIS Channel Assignment SentenceALR AlarmAS AssignedATIS Automatic Transmitter Identification SystemAU AutonomousBcastChM Broadcast Channel ManagementBRG Vessel True BearingCOG Course Over GroundDAC Designated Area CodeDest DestinationDGNSS Differential Global Navigation Satellite ServiceDist DistanceDSC Digital Selective CallingDTE Data Terminal EquipmentECDIS Electronic Chart DisplayENI European Vessel Identification NumberEPFD Electronic Position Fixing DeviceEPFS Electronic Position Fixing SystemERI Ship Types – add. types to IMO high sea ship typesESN European Ship NumberETA Estimated Arrival TimeExtGPS External Global Positioning SystemExtHDT External Heading TrueExtSOG External Speed Over GroundGNSS Global Navigation Satellite ServiceGPS Global Positioning SystemIMO No International Maritime Association NumberIN Interrogation/Polled ModeExtCOG External Course Over GroundIntGPS Internal Global Positioning SystemLAT LatitudeLON LongitudeLRI Long Range InterrogationMMSI Maritime Mobile Service IdentityMOB Man Over BoardMod ModeNavStat Navigational StatusNm Nautic MilesOpManual Operator ManualPoB Persons on BoardPos PositionPosAcc Position AccuracyReg RegionRNG RatingRng Vessel RangeROT Rate of TurnRxA Receiving AIS ChannelRxB Broadcasting AIS ChannelRXVe Received vesselsSOG Speed Over GroundSRM Safety Related MessageSyn synchronizationTrZone Transitional ZoneTxA Transmitting on Channel ATxB Transmitting on Channel BUTC Universal Time CoordinatedVHF Very High Frequency