User Manual 115 Y1-03-0211 Rev. BAbbreviation Full TextA/B (A+B) AIS Channel 1 / AIS Channel 2ACK AcknowledgementAddrChM Addressed Channel ManagementAIS Automatic Identification SystemAIS_ChAs AIS Channel Assignment SentenceALR AlarmAS AssignedAU AutonomousBcastChM Broadcast Channel ManagementBRG Vessel True BearingCOG Course Over GroundDest DestinationDGNSS Differential Global Navigation Satellite ServiceDist DistanceDSC Digital Selective CallingDTE Data Terminal EquipmentECDIS Electronic Chart DisplayEPFD Electronic Position Fixing DeviceEPFS Electronic Position Fixing SystemETA 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 ModeIntCOG Internal Course Over GroundAbbreviation Full TextIntGPS 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