R5 SOLID AIS SystemINTERPRETATION OF OUTPUT SENTENCES7000 118-200, C2 Page 769.3 AIS Output Sentences9.3.1 ABK – AIS Addressed and binary broadcast acknowledgement$ -- ABK,xxxxxxxxx,x,x.x,x,xOutput rate: On event.Field Format Name Comment1 --ABK Sentence Id Used2 xxxxxxxxx MMSI of the addressed AISunitUsed3 x AIS channel of reception Used4 x.x ITU - R M.1371 Message ID Used5 x Message sequence number Used6 x Type of acknowledgement Used9.3.2 ACA – AIS Regional Channel Assignment Message$--ACA,x,llll.ll,a,yyyy.yy,a,llll.ll,a,yyyy.yy,a,x,xxxx,x,xxxx,x,x,x,a,x,hhmmss.ssOutput rate: On event. On request.Field Format Name Comment1 --ACA Sentence Id Used2 x Sequence number Ignored3 llll.ll NE latitude (2 fields) Used4 a5 yyyy.yy NE longitude (2 fields) Used6 a7 llll.ll SW latitude (2 fields) Used8 a9 yyyy.yy SW longitude (2 fields) Used10 a11 x Transitional zone size Used12 xxxx Channel A Used13 x Channel A bandwidth Used14 xxxx Channel B Used15 x Channel B bandwidth Used16 x Tx/Rx mode Used17 x Power level Used18 a Information source Ignored19 x In use flag Ignored20 hhmmss.ssTime of In use change Ignored9.3.3 ALR – Set alarm state$--ALR,hhmmss.ss,xxx,A, A,c--cOutput rate: On event, on request, and automatically. Output every30s for active alarms and every 60s when no active alarms.Field Format Name Comment1 --ALR Sentence Id Used2 hhmmss.ss Time of alarm conditionchange, UTCUsed3 XxxUnique alarm number(identifier) at alarmsourceUsed4 A Alarm conditionA = threshold exceededUsed