Online AIS NMEA decoder

[jvde-github]

Added a new tool to the community hub with various examples of AIS messages:

https://www.aiscatcher.org/tools/nmea-decoder

[Dirk--]

Thanks Jasper! Convenient tool to examine your latest efforts on decoding binary messages ( #379 (reply in thread) ).
On top of my wish list: Please add SUB-application ID where applicable e.g.

• Weather Station Message 8/316/1/1
• Wind Information Message 8/316/1/2
• Water Level Message 8/316/1/3

[jvde-github]

Found some examples

!AIVDM,3,1,2,A,8h3Owj1?0@>`nPPPPP<j>nsphTtHBR9l@02`nPPPPP<iCnsm<4tPG2:0,0*50
!AIVDM,3,2,2,A,@02`nPPPPP<jCnssG4tCk2Ot@02`nPPPPP<i>nskl4tSp1lH@02`nPPP,0*53
!AIVDM,3,3,2,A,P<pC5nsT`4r9d4?n@02`nPPPPP<k>nsuPTt6m2Oa@00,2*41
!AIVDM,3,1,3,B,8030osi?0@>`nPPPPP<j>nsphTtHBR9l@02`nPPPPP<iCnsm<4tPG2:0,0*2C
!AIVDM,3,2,3,B,@02`nPPPPP<jCnssG4tCk2Ot@02`nPPPPP<i>nskl4tSp1lH@02`nPPP,0*51
!AIVDM,3,3,3,B,P<pC5nsT`4r9d4?n@02`nPPPPP<k>nsuPTt6m2Oa@00,2*43
!AIVDM,3,1,4,A,8030ot1?0@>`nPPPPP<j>nsphTtHBR9l@02`nPPPPP<iCnsm<4tPG2:0,0*77
!AIVDM,3,2,4,A,@02`nPPPPP<jCnssG4tCk2Ot@02`nPPPPP<i>nskl4tSp1lH@02`nPPP,0*55
!AIVDM,3,3,4,A,P<pC5nsT`4r9d4?n@02`nPPPPP<k>nsuPTt6m2Oa@00,2*47
!AIVDM,3,1,0,B,8030otA?0@>`nPPPPP<j>nsphTtHBR9l@02`nPPPPP<iCnsm<4tPG2:0,0*00
!AIVDM,3,2,0,B,@02`nPPPPP<jCnssG4tCk2Ot@02`nPPPPP<i>nskl4tSp1lH@02`nPPP,0*52
!AIVDM,3,3,0,B,P<pC5nsT`4r9d4?n@02`nPPPPP<k>nsuPTt6m2Oa@00,2*40
!AIVDM,2,1,4,A,8h3OwjQ?0@J`e0PP6eD<?oL;j59`Uf3h002`m0P6e2?8@oRhA5;oodVP,0*22
!AIVDM,2,2,4,A,002`m0P6e31C3oRK65;qv0S0000,2*44

And added decoders, needs further testing.

[Dirk--]

Guess, this is all I harvested so far:
6/316/2/2:

!AIVDM,2,1,9,B,6030ot0nVMPPCh82abSp888888884Si3l2H8883<<bJ`I<i=tk3>VcEC,0*2D
!AIVDM,2,2,9,B,<CO<lGac5P00000000,4*58

AIS-Decoder:

Creation Time Local,21.10.2025 10:20:45,,
Creation Time Unix UTC,1761034845,21.10.2025 08:20:45,
Nmea Sentence,"!AIVDM,2,2,9,B,<CO<lGac5P00000000,4*58,21.10.2025 08:20:32",,
Received Time UTC-Unix,21.10.2025 08:20:32,1761034832,
Talker,AI,Mobile class A or B,
Sentence,VDM,AIS VHF data-link message,
AIS Sentence,!AIVDM,Mobile class A or B,
Fragments in this message,2,,
Fragment No,2,,
Sequential Message ID,9,,
Radio Channel,B,,
Payload,<CO<lGac5P00000000,104 bits (18 6-bit words),
Fill bits,4,,
CRC check,58,,
AIS Payload,6030ot0nVMPPCh82abSp888888884Si3l2H8883<<bJ`I<i=tk3>VcEC<CO<lGac5P00000000,440 bits (55 8-bit words),
Vessel Name,,Not yet received,
AIS Message Type,6,Addressed Binary Message,
Repeat Indicator,0,Repeatable,
MMSI,003160048,Shore Station,
MID,316,Canada,
Sequence Number,0,,
Destination MMSI,229013000,RODOPI,
MID,229,not in use,
Retransmit Flag,0,,
Spare,0,1 bit,
Binary Data,4F0202A6A8F8208208208208123C43D026082080CC32A6A864CC4DF330CE9AB5533137CCD17A6B16000000000000,Hex Binary Data (368 bits),
DAC,316,Canada,
FI,2,Vessel/Lock Scheduling,
Spare,0,2 bits,
Message ID,2,Estimated Lock Times Message,
Month,10,,
Day,13,,
Hour,10,,
Minute,15,,
Vessel Name,         RODOPI,15 characters,
Last Location,    L02,7 characters,
Last ATA Month,10,,
Last ATA Day,13,,
Last ATA Hour,10,,
Last ATA Minute,06,,
First Lock,SLS_L03,Welland Canal Lock 3,
First Lock ETA Month,10,,
First Lock ETA Day,13,,
First Lock ETA Hour,11,,
First Lock ETA Minute,21,,
Second Lock,SLS_L4W,Welland Canal Lock 4 West,
Second Lock ETA Month,10,,
Second Lock ETA Day,13,,
Second Lock ETA Hour,12,,
Second Lock ETA Minute,22,,
Delay,@@@@@@@,7 characters,
Spare,0,4 bits,

8/316/1/1:

!AIVDM,2,1,3,B,8030otA?0@6Va0PPP121IoCol54cd1?wuTwwis3qTP2VaBPPP121IoCo,0*13
!AIVDM,2,2,3,B,l54cd2Uwp=wwis3iTP2Va<PPP121IoCol54cd25wuEwwit3uTP0,2*73

AIS-Decoder:

Creation Time Local,21.10.2025 10:23:42,,
Creation Time Unix UTC,1761035022,21.10.2025 08:23:42,
Nmea Sentence,"!AIVDM,2,2,3,B,l54cd2Uwp=wwis3iTP2Va<PPP121IoCol54cd25wuEwwit3uTP0,2*73,21.10.2025 08:23:36",,
Received Time UTC-Unix,21.10.2025 08:23:36,1761035016,
Talker,AI,Mobile class A or B,
Sentence,VDM,AIS VHF data-link message,
AIS Sentence,!AIVDM,Mobile class A or B,
Fragments in this message,2,,
Fragment No,2,,
Sequential Message ID,3,,
Radio Channel,B,,
Payload,l54cd2Uwp=wwis3iTP2Va<PPP121IoCol54cd25wuEwwit3uTP0,304 bits (51 6-bit words),
Fill bits,2,,
CRC check,73,,
AIS Payload,8030otA?0@6Va0PPP121IoCol54cd1?wuTwwis3qTP2VaBPPP121IoCol54cd2Uwp=wwis3iTP2Va<PPP121IoCol54cd25wuEwwit3uTP0,640 bits (80 8-bit words),
Vessel Name,,Not yet received,
AIS Message Type,8,Binary Broadcast Message,
Repeat Indicator,0,Repeatable,
MMSI,003160049,Shore Station,
MID,316,Canada,
Spare,0,2 bits,
Binary Data,4F0101A6A408208010816774F7D0512BB013FFF64FFFC7B0F99200A6A528208010816774F7D0512BB0297FE0DFFFC7B0F19200A6A4C8208010816774F7D0512BB0217FF55FFFC7C0FD9200,Hex Binary Data (600 bits),
DAC,316,Canada,
FI,1,Metrological and Hydrological,
Spare,0,2 bits,
Message ID,1,Weather Station Message,
Station,1,,
Month,10,,
UTC Day,13,,
UTC Hour,09,,
UTC Minute,00,,
Sensor ID,   ABAY,7 characters,
Longitude,-75.93000,"75° 55,800' W",
Latitude,44.33000,"44° 19,800' N",
Wind Speed,"3,9",Knots,
Wind Gust,"102,3",Not available,
Wind Direction,356,° (degrees),
Air Temperature,"12,3","12,3 °C",
Dew Point,"6,2","6,2 °C",
Visibility,"10,0",Kilometers,
Water Temperature,"-51,2",Not available,
Station,2,,
Month,10,,
UTC Day,13,,
UTC Hour,09,,
UTC Minute,18,,
Sensor ID,   ABAY,7 characters,
Longitude,-75.93000,"75° 55,800' W",
Latitude,44.33000,"44° 19,800' N",
Wind Speed,"8,2",Knots,
Wind Gust,"102,3",Not available,
Wind Direction,13,° (degrees),
Air Temperature,"12,3","12,3 °C",
Dew Point,"6,0","6,0 °C",
Visibility,"10,0",Kilometers,
Water Temperature,"-51,2",Not available,
Station,3,,
Month,10,,
UTC Day,13,,
UTC Hour,09,,
UTC Minute,12,,
Sensor ID,   ABAY,7 characters,
Longitude,-75.93000,"75° 55,800' W",
Latitude,44.33000,"44° 19,800' N",
Wind Speed,"6,6",Knots,
Wind Gust,"102,3",Not available,
Wind Direction,341,° (degrees),
Air Temperature,"12,4","12,4 °C",
Dew Point,"6,3","6,3 °C",
Visibility,"10,0",Kilometers,
Water Temperature,"-51,2",Not available,

8/316/1/2:

!AIVDM,3,1,6,A,8030ot1?0@:VA`PPPP9B?oHHVU8F>2mviJ2VA`PPPP2hmnsvSTt0DP`6,0*4B
!AIVDM,3,2,6,A,A42VA`PPPPnskl4tSpAPKPe2VA`PPPP3C3oU<;U<TwQAvhG2VA`PP,0*21
!AIVDM,3,3,6,A,PP2?koRVPU;r<2mvhG2VA`PPPP@ihoQ:PU;?I0uvi40,2*7F
!AIVDM,3,1,7,B,8030ot1?0@:VA`PPPP9B?oHHVU8F>2mviJ2VA`PPPP2hmnsvSTt0DP`6,0*49
!AIVDM,3,2,7,B,A42VA`PPPP<i>nskl4tSpAPKPe2VA`PPPP3C3oU<;U<TwQAvhG2VA`PP,0*23
!AIVDM,3,3,7,B,PP2?koRVPU;r<2mvhG2VA`PPPP@ihoQ:PU;?I0uvi40,2*7D
!AIVDM,3,1,7,A,8030ot1?0@:VANPPPP9B?oHHVU8F>1qvi42VANPPPP2hmnsvSTt0DP`3,0*2E
!AIVDM,3,2,7,A,i42VANPPPP<i>nskl4tSpJpLhe2VANPPPP3C3oU<;U<TwR=vhG2VANPP,0*4D
!AIVDM,3,3,7,A,PP2?koRVPU;r<3MvhG2VANPPPP@ihoQ:PU;?I2=vhe0,2*6B

AIS-Decoder:

Creation Time Local,21.10.2025 10:25:00,,
Creation Time Unix UTC,1761035100,21.10.2025 08:25:00,
Nmea Sentence,"!AIVDM,3,3,7,A,PP2?koRVPU;r<3MvhG2VANPPPP@ihoQ:PU;?I2=vhe0,2*6B,21.10.2025 08:24:55",,
Received Time UTC-Unix,21.10.2025 08:24:55,1761035095,
Talker,AI,Mobile class A or B,
Sentence,VDM,AIS VHF data-link message,
AIS Sentence,!AIVDM,Mobile class A or B,
Fragments in this message,3,,
Fragment No,3,,
Sequential Message ID,7,,
Radio Channel,A,,
Payload,PP2?koRVPU;r<3MvhG2VANPPPP@ihoQ:PU;?I2=vhe0,256 bits (43 6-bit words),
Fill bits,2,,
CRC check,6B,,
AIS Payload,8030ot1?0@:VANPPPP9B?oHHVU8F>1qvi42VANPPPP2hmnsvSTt0DP`3i42VANPPPP<i>nskl4tSpJpLhe2VANPPPP3C3oU<;U<TwR=vhG2VANPPPP2?koRVPU;r<3MvhG2VANPPPP@ihoQ:PU;?I2=vhe0,928 bits (116 8-bit words),
Vessel Name,,Not yet received,
AIS Message Type,8,Binary Broadcast Message,
Repeat Indicator,0,Repeatable,
MMSI,003160048,Shore Station,
MID,316,Canada,
Spare,0,2 bits,
Binary Data,4F0102A645E8208202523F76189A5216381E7EC440A645E8208200B0D76EFE8E4F00520A03C440A645E8208203313B6EF3D04F23E1AE1CC2D0A645E8208200D30F794C2E5324FE237EC170A645E82082008FCF78A68252FA30377EC170A645E820820431C3784A8252CF64237EC2D0,Hex Binary Data (888 bits),
DAC,316,Canada,
FI,1,Metrological and Hydrological,
Spare,0,2 bits,
Message ID,2,Wind Information Message,
Sensor Report No,1,,
Month,10,,
UTC Day,12,,
UTC Hour,17,,
UTC Minute,30,,
Sensor ID,    IRO,7 characters,
Longitude,-75.31392,"75° 18,835' W",
Latitude,44.83033,"44° 49,820' N",
Wind Speed,"6,0",Knots,
Wind Gust,"101,4",Knots,
Wind Direction,68,ENE,
Spare,0,4 bits,
Sensor Report No,2,,
Month,10,,
UTC Day,12,,
UTC Hour,17,,
UTC Minute,30,,
Sensor ID,    B05,7 characters,
Longitude,-79.19241,"79° 11,545' W",
Latitude,43.14522,"43° 8,713' N",
Wind Speed,"2,0",Knots,
Wind Gust,"3,0",Knots,
Wind Direction,68,ENE,
Spare,0,4 bits,
Sensor Report No,3,,
Month,10,,
UTC Day,12,,
UTC Hour,17,,
UTC Minute,30,,
Sensor ID,    L1N,7 characters,
Longitude,-79.21533,"79° 12,920' W",
Latitude,43.22107,"43° 13,264' N",
Wind Speed,"86,0",Knots,
Wind Gust,"23,0",Knots,
Wind Direction,45,NE,
Spare,0,4 bits,
Sensor Report No,4,,
Month,10,,
UTC Day,12,,
UTC Hour,17,,
UTC Minute,30,,
Sensor ID,    CSC,7 characters,
Longitude,-73.56548,"73° 33,929' W",
Latitude,45.40798,"45° 24,479' N",
Wind Speed,"7,0",Knots,
Wind Gust,"101,4",Knots,
Wind Direction,23,NNE,
Spare,0,4 bits,
Sensor Report No,5,,
Month,10,,
UTC Day,12,,
UTC Hour,17,,
UTC Minute,30,,
Sensor ID,    BO3,7 characters,
Longitude,-73.91891,"73° 55,135' W",
Latitude,45.31667,"45° 19,000' N",
Wind Speed,"11,0",Knots,
Wind Gust,"101,4",Knots,
Wind Direction,23,NNE,
Spare,0,4 bits,
Sensor Report No,6,,
Month,10,,
UTC Day,12,,
UTC Hour,17,,
UTC Minute,30,,
Sensor ID,    P10,7 characters,
Longitude,-74.11518,"74° 6,911' W",
Latitude,45.22537,"45° 13,522' N",
Wind Speed,"7,0",Knots,
Wind Gust,"101,4",Knots,
Wind Direction,45,NE,
Spare,0,4 bits,

8/316/1/3:

!AIVDM,2,1,6,,8030osA?0@>U:jPPPB38jnsuPTt6m2Oa@02U:jPPPB38knsvSTt0DRnA@02U:,0*55
!AIVDM,2,2,6,,jPPPB38nnsvA4so@Soi@02U:jPPP<<F<nsUvTr?DT?0@00,2*4C

AIS-Decoder:

Creation Time Local,21.10.2025 10:26:43,,
Creation Time Unix UTC,1761035203,21.10.2025 08:26:43,
Nmea Sentence,"!AIVDM,2,2,6,,jPPPB38nnsvA4so@Soi@02U:jPPP<<F<nsUvTr?DT?0@00,2*4C,21.10.2025 08:26:36",,
Received Time UTC-Unix,21.10.2025 08:26:36,1761035196,
Talker,AI,Mobile class A or B,
Sentence,VDM,AIS VHF data-link message,
AIS Sentence,!AIVDM,Mobile class A or B,
Fragments in this message,2,,
Fragment No,2,,
Sequential Message ID,6,,
Radio Channel,,(blank),
Payload,jPPPB38nnsvA4so@Soi@02U:jPPP<<F<nsUvTr?DT?0@00,274 bits (46 6-bit words),
Fill bits,2,,
CRC check,4C,,
AIS Payload,8030osA?0@>U:jPPPB38jnsuPTt6m2Oa@02U:jPPPB38knsvSTt0DRnA@02U:jPPPB38nnsvA4so@Soi@02U:jPPP<<F<nsUvTr?DT?0@00,640 bits (80 8-bit words),
Vessel Name,,Not yet received,
AIS Message Type,8,Binary Broadcast Message,
Repeat Indicator,0,Repeatable,
MMSI,003160045,Shore Station,
MID,316,Canada,
Spare,0,2 bits,
Binary Data,4F0103A52B28208120C8CB6EFD824F06D427E94000A52B28208120C8CF6EFE8E4F00522D914000A52B28208120C8DB6EFE444EF7423DF14000A52B282080C316336EE5FA4E8F5243C04000,Hex Binary Data (600 bits),
DAC,316,Canada,
FI,1,Metrological and Hydrological,
Spare,0,2 bits,
Message ID,3,Water Level Message,
Sensor Report No,1,,
Month,10,,
UTC Day,10,,
UTC Hour,10,,
UTC Minute,50,,
Station ID,   RCH2,7 characters,
Longitude,-79.19465,"79° 11,679' W",
Latitude,43.15910,"43° 9,546' N",
Water Level Type,0,Relative to reference datum,
Water Level,"102,17",Meters,
Reference Datum,1,IGLD-85,
Spare,0,14 bits,
Sensor Report No,2,,
Month,10,,
UTC Day,10,,
UTC Hour,10,,
UTC Minute,50,,
Station ID,   RCH3,7 characters,
Longitude,-79.19241,"79° 11,545' W",
Latitude,43.14522,"43° 8,713' N",
Water Level Type,0,Relative to reference datum,
Water Level,"116,65",Meters,
Reference Datum,1,IGLD-85,
Spare,0,14 bits,
Sensor Report No,3,,
Month,10,,
UTC Day,10,,
UTC Hour,10,,
UTC Minute,50,,
Station ID,   RCH6,7 characters,
Longitude,-79.19303,"79° 11,582' W",
Latitude,43.12589,"43° 7,553' N",
Water Level Type,0,Relative to reference datum,
Water Level,"158,57",Meters,
Reference Datum,1,IGLD-85,
Spare,0,14 bits,
Sensor Report No,4,,
Month,10,,
UTC Day,10,,
UTC Hour,10,,
UTC Minute,50,,
Station ID,   LLVL,7 characters,
Longitude,-79.24485,"79° 14,691' W",
Latitude,42.90415,"42° 54,249' N",
Water Level Type,0,Relative to reference datum,
Water Level,"173,44",Meters,
Reference Datum,1,IGLD-85,
Spare,0,14 bits,

8/316/2/1:

!AIVDM,2,1,3,A,8030ot1?0P6VANC<CO<hjnsqiTtFe02222222220`tPr0CC9c0222222,0*12
!AIVDM,2,2,3,A,21@4l584<eC@MP2220QDA<tpM84<QAC@rP0,2*60
!AIVDM,2,1,7,B,8030ot1?0P6VBNC<CO<nGnsv?Tsqj02222222220`tPr0CC;I0222222,0*7B
!AIVDM,2,2,7,B,22218t@u0WCF`00Hhu8Dp<F1=0U8UCCHsP0,2*14
!AIVDM,2,1,8,B,8030ot1?0P6VBNC<CO<hknsuq4t54P2222222220`tPr0CC:<0222222,0*7A
!AIVDM,2,2,8,B,21@4l584<eC@702220QDA<tpM84<QAC@`P0,2*60
!AIVDM,2,1,9,A,8030ot1?0P6VBNC<CO<hknsuq4t54P2222222220`tPr0CC:<0222222,0*78
!AIVDM,2,2,9,A,21@4l584<eC@702220QDA<tpM84<QAC@`P0,2*62
!AIVDM,2,1,7,,8h3Owj1?0P6U:eC<CO<hknsuq4t54P2222222220<DhTp7BVp004hLtl60MD5,0*23
!AIVDM,2,2,7,,8@T4qBbTP0HD@E84j0dUH4hTsBbg00,2*35

AIS-Decoder:

Creation Time Local,21.10.2025 10:27:52,,
Creation Time Unix UTC,1761035272,21.10.2025 08:27:52,
Nmea Sentence,"!AIVDM,2,2,7,,8@T4qBbTP0HD@E84j0dUH4hTsBbg00,2*35,21.10.2025 08:27:48",,
Received Time UTC-Unix,21.10.2025 08:27:48,1761035268,
Talker,AI,Mobile class A or B,
Sentence,VDM,AIS VHF data-link message,
AIS Sentence,!AIVDM,Mobile class A or B,
Fragments in this message,2,,
Fragment No,2,,
Sequential Message ID,7,,
Radio Channel,,(blank),
Payload,8@T4qBbTP0HD@E84j0dUH4hTsBbg00,178 bits (30 6-bit words),
Fill bits,2,,
CRC check,35,,
AIS Payload,8h3Owj1?0P6U:eC<CO<hknsuq4t54P2222222220<DhTp7BVp004hLtl60MD58@T4qBbTP0HD@E84j0dUH4hTsBbg00,544 bits (68 8-bit words),
Vessel Name,,Not yet received,
AIS Message Type,8,Binary Broadcast Message,
Repeat Indicator,3,Do not repeat,
MMSI,003669960,Shore Station,
MID,366,United States of America,
Spare,0,2 bits,
Binary Data,4F0201A52AD4CC4DF330CF6EFDE44F05120082082082082080314C24E074A6E00004C1CF341807541484241394AA92001851054813202C95813093B4AABC00,Hex Binary Data (504 bits),
DAC,316,Canada,
FI,2,Vessel/Lock Scheduling,
Spare,0,2 bits,
Message ID,1,Lockage Order Message,
Month,10,,
Day,10,,
Hour,10,,
Minute,45,,
Lock ID,SLS_L03,Welland Canal Lock 3,
Longitude,-79.19383,"79° 11,630' W",
Latitude,43.15535,"43° 9,321' N",
Spare,0,9 bits,
Vessel Name 1,         CELINA,15 characters,
Direction,1,Up bound,
ETA Month,10,,
ETA UTC Day,10,,
ETA UTC Hour,13,,
ETA UTC Minute,48,,
Spare,0,9 bits,
Vessel Name 2,ALGOMA GUARDIAN,15 characters,
Direction,0,Down bound,
ETA Month,10,,
ETA UTC Day,10,,
ETA UTC Hour,21,,
ETA UTC Minute,09,,
Spare,0,9 bits,
Vessel Name 3,FEDERAL KIVALIN,15 characters,
Direction,1,Up bound,
ETA Month,10,,
ETA UTC Day,10,,
ETA UTC Hour,21,,
ETA UTC Minute,30,,
Spare,0,9 bits,

To my understanding, in this context

• ASM payload of MSG:6 and MSG:8 is the same
• ASM payload of DAC:316 and DAC:366 is the same

[jvde-github]

Thanks. FID = 1 seems to be decoding in full and the numbers make some sense. Do you know of another package that we can compare this against to validate?

FID=2 still to be added then....

[Dirk--]

Added a row 'AIS-Decoder' (IMO still the best) at spreadsheet https://github.com/Dirk--/AIS-testing/blob/main/binary-ais.csv . Comparing decoders was my initial intention. All of this 'work in progress', see also https://wiki.opennauticalchart.org/index.php?title=AIS-Decoding

[Dirk--]

this might explain environmental-data best: https://seaway-greatlakes.com/environment-info/water-levels
Specs: https://greatlakes-seaway.com/wp-content/uploads/2020/05/Seaway-AIS-message-specifications-R41.pdf

[Dirk--]

here comes the missing water-flow example 8/316/1/6:

!AIVDM,2,1,9,B,8030ot1?0@JbS0PP6eD<?oL;j59`Ue2`002b`0P6e2?8@oRhA5;oodTp,0*7E
!AIVDM,2,2,9,B,002b`0P6e31C3oRK65;qv0S8000,2*4D

AIS-Decoder:

Creation Time Local,21.10.2025 11:45:39,,
Creation Time Unix UTC,1761039939,21.10.2025 09:45:39,
Nmea Sentence,"!AIVDM,2,2,9,B,002b`0P6e31C3oRK65;qv0S8000,2*4D,21.10.2025 09:42:32",,
Received Time UTC-Unix,21.10.2025 09:42:32,1761039752,
Talker,AI,Mobile class A or B,
Sentence,VDM,AIS VHF data-link message,
AIS Sentence,!AIVDM,Mobile class A or B,
Fragments in this message,2,,
Fragment No,2,,
Sequential Message ID,9,,
Radio Channel,B,,
Payload,002b`0P6e31C3oRK65;qv0S8000,160 bits (27 6-bit words),
Fill bits,2,,
CRC check,4D,,
AIS Payload,8030ot1?0@JbS0PP6eD<?oL;j59`Ue2`002b`0P6e2?8@oRhA5;oodTp002b`0P6e31C3oRK65;qv0S8000,496 bits (62 8-bit words),
Vessel Name,,Not yet received,
AIS Message Type,8,Binary Broadcast Message,
Repeat Indicator,0,Repeatable,
MMSI,003160048,Shore Station,
MID,316,Canada,
Spare,0,2 bits,
Binary Data,4F0106AA8C08201AD50C3F770BC8526896D0A80000AAA00806B423C84378B04452F7DEC9380000AAA00806B430530F789B1852F9F808C80000,Hex Binary Data (456 bits),
DAC,316,Canada,
FI,1,Metrological and Hydrological,
Spare,0,2 bits,
Message ID,6,Water Flow Message,
Sensor Report No,1,,
UTC Month,10,,
UTC Day,21,,
UTC Hour,03,,
UTC Minute,00,,
Station ID,  F-TLO,7 characters,
Longitude,-74.79514,"74° 47,708' W",
Latitude,45.00605,"45° 0,363' N",
Water Flow,6677,cubic meters/sec,
Spare,0,19 bits,
Sensor Report No,2,,
UTC Month,10,,
UTC Day,21,,
UTC Hour,08,,
UTC Minute,00,,
Station ID, F-BOHP,7 characters,
Longitude,-73.89810,"73° 53,886' W",
Latitude,45.31172,"45° 18,703' N",
Water Flow,6439,cubic meters/sec,
Spare,0,19 bits,
Sensor Report No,3,,
UTC Month,10,,
UTC Day,21,,
UTC Hour,08,,
UTC Minute,00,,
Station ID, F-CASC,7 characters,
Longitude,-73.94327,"73° 56,596' W",
Latitude,45.31620,"45° 18,972' N",
Water Flow,281,cubic meters/sec,
Spare,0,19 bits,

[jvde-github]

Good links and intel, many thanks. Have installed AISdecoder as well so could be a good reference to check implementation.

[Dirk--]

8/367/33 (source: https://www.yachtd.com/news/ais_weather_data.html )

!AIVDM,1,1,,B,8>k1oKiKpB9GO>42lBPWmre0<N00,0*55

AIS-Decoder:

Creation Time Local,30.10.2025 15:54:01,,
Creation Time Unix UTC,1761836041,30.10.2025 14:54:01,
Nmea Sentence,"!AIVDM,1,1,,B,8>k1oKiKpB9GO>42lBPWmre0<N00,0*55,30.10.2025 14:53:29",,
Received Time UTC-Unix,30.10.2025 14:53:29,1761836009,
Talker,AI,Mobile class A or B,
Sentence,VDM,AIS VHF data-link message,
AIS Sentence,!AIVDM,Mobile class A or B,
Fragments in this message,1,,
Fragment No,1,,
Sequential Message ID,,(blank),
Radio Channel,B,,
Payload,8>k1oKiKpB9GO>42lBPWmre0<N00,168 bits (28 6-bit words),
Fill bits,0,,
CRC check,55,,
AIS Payload,8>k1oKiKpB9GO>42lBPWmre0<N00,168 bits (21 8-bit words),
Vessel Name,,Not yet received,
AIS Message Type,8,Binary Broadcast Message,
Repeat Indicator,0,Repeatable,
MMSI,993032047,AtoN,
MID,303,Alaska (State of),
Spare,0,2 bits,
Binary Data,5BE122577CE102D12827D7AB4031E000,Hex Binary Data (128 bits),
DAC,367,United States of America,
FI,33,Environmental,
Sensor Report No,1,,
Report Type,2,Wind,
UTC Day,04,,
UTC Hour,21,,
UTC Minute,55,,
Site ID,103,,
Average Wind Speed,4,Knots,
Wind Gust,5,Knots,
Wind Direction,324,Degrees,
Wind Gust Direction,321,Degrees,
Sensor Data Description,1,raw real time,
Forecast Wind Speed,122,Not available (default),
Forecast Gust,122,Not available (default),
Forecast Direction,360,Not available (default),
Valid Day of Forecast,00,not available (default),
Valid Hour of Forecast,24,not available (default),
Valid Minute of Forecast,60,not available (default),
Duration of Forecast,0,Cancel Forecast (default),
Spare,0,3 bits,

I did not catch any interesting DAC:366 messages, yet. @jvde-github : https://www.aiscatcher.org/station/2511 might be a source ...

[jvde-github]

Thanks. I have added this particular message to the JSON but struggle to find a good documentation on the web.

[jvde-github]

{"class":"AIS","device":"AIS-catcher","version":0,"driver":0,"hardware":"","rxtime":"20251030215652","scaled":true,"channel":"B","nmea":["!AIVDM,1,1,,B,8>k1oKiKpB9GO>42lBPWmre0<N00,0*55"],"signalpower":1024.000000,"ppm":1024.000000,"type":8,"repeat":0,"mmsi":993032047,"dac":367,"fid":33,"report_type":2,"day":4,"hour":21,"minute":55,"site_id":103,"wspeed":4,"wgust":5,"wdir":324,"wgustdir":321,"sensor_description":1,"forecast_wspeed":122,"forecast_wgust":122,"forecast_duration":0}

[jvde-github]

!AIVDM,1,1,,A,85NAFt1Kf74G4w3M=E9ojkuDNc5wA?WMuVO9T>?CVeIaK;T4KHG=,0*57
!AIVDM,1,1,,A,85PH6mAKf5gd>1rf:Mju?Q2l0fO>jr3KE66GD0wekqCmAg36C3RR,0*35
!AIVDM,1,1,,A,85NQB:1Kf7WkGfMTGT3Ewv>sMs1`dcPBt@D9bTJUrRbFobFV7aUQ,0*1B
!AIVDM,1,1,,A,85N?q<1Kf1KjGMhw0hTs>Sq7;2=82<lbuTwo?GNt992lwRqNqWPn,0*71
!AIVDM,1,1,,A,842NG4QKdcUnsfQQ<k;SF8:CsTh9vrCrQ>?dHR>tt=UF>2LT>1jD,0*66
!AIVDM,1,1,,A,85N?q<1Kf1KjGMhw0hTs>Sq7;2=82<lbuTwo?GNt992lwRqNqWPn,0*71
!AIVDM,1,1,,A,85OnGj1Kf64ugllhRsQ;EiMgsAIuq6nDmHJh3doHPK?0fN2Eg`u@,0*63
!AIVDM,1,1,,B,85NP`eQKf<oOpAE>=DO4vcsIG4UOCLdhKlLKbTaorL?He44Bpb0I,0*43

FID 56 and 50

[Dirk--]

6/232/1 from https://github.com/mjaros/ais-decoder/blob/master/examples/messages.txt :
!BSVDM,1,1,,A,63MA?QD0SJP@>P5m;C45qdG?H@,4*0B

AIS-Decoder:

Creation Time Local,31.10.2025 14:44:52,,
Creation Time Unix UTC,1761918292,31.10.2025 13:44:52,
Nmea Sentence,"!BSVDM,1,1,,A,63MA?QD0SJP@>P5m;C45qdG?H@,4*0B,31.10.2025 13:44:45",,
Received Time UTC-Unix,31.10.2025 13:44:45,1761918285,
Talker,BS,AIS Base Station,
Sentence,VDM,AIS VHF data-link message,
AIS Sentence,!BSVDM,AIS Base Station,
Fragments in this message,1,,
Fragment No,1,,
Sequential Message ID,,(blank),
Radio Channel,A,,
Payload,63MA?QD0SJP@>P5m;C45qdG?H@,152 bits (26 6-bit words),
Fill bits,4,,
CRC check,0B,,
AIS Payload,63MA?QD0SJP@>P5m;C45qdG?H@,152 bits (19 8-bit words),
Vessel Name,,Not yet received,
AIS Message Type,6,Addressed Binary Message,
Repeat Indicator,0,Repeatable,
MMSI,232017797,,
MID,232,United Kingdom of Great Britain and Northern Ireland,
Sequence Number,1,,
Destination MMSI,002320900,Shore Station,
MID,232,United Kingdom of Great Britain and Northern Ireland,
Retransmit Flag,0,,
Spare,0,1 bit,
Binary Data,3A01752D3105E6C5CF61,Hex Binary Data (80 bits),
DAC,232,United Kingdom of Great Britain and Northern Ireland,
FI,1,Used by Port of London Authority (PLA) {Not decoded},

[Dirk--]

documentation on 6/232/1 : https://web.archive.org/web/20160506023151/https://pla.co.uk/assets/APPENDIX_I__II_amendment_for_2012_byelaws_FINAL.pdf (encrypted POB).

To my understanding, this is replaced. See https://pla.co.uk/thames-ais

[Dirk--]

and lots of rare samples @ https://github.com/loicpw/lpais/blob/0b245259b633d322cc2bbe76122444bc9cebcce9/tests/data/samples.raw e.g.:

• 8/1/22: !AIVDM,1,1,,B,803Ovrh0EP:024`@02PN04da=3V<>N0000,4*39
• 8/366/1/1: !AIVDM,1,1,,A,803OdJQKP@5=l0B3PPPPPnGG:5Bnf3RB8LVV0sP3wP0,2*4A
• 8/366/33/3: !AIVDM,1,1,,A,8h3Ovn1K`CoO02wwv0T000ip0000,0*52
• 8/366/33/9: !AIVDM,1,1,7,B,8P3QiWAKIoOH>7qOWGI4gf0000?Mt0H0jTB@0037P0000,2*72
• 8/366/34: !AIVDM,1,1,,A,803OvriKQPMQ;T6gGiCV3ThT;0,0*3C

[g7ruh]

Jasper,

A little more from South Bramble in The Solent, you already display Water Temp

From this

!AIVDM,2,1,6,A,8>jHDhh0Gwu>ALw:4::?wvlFR06EuOwgwl>8@l?Q20r4<wwsAwwnSB4,05D
!AIVDM,2,2,6,A,wwh000,44C`

your decode page gives cspeed 1.6 and cdir 269 with watertemp 13.2
verification from OpenCPN:

I note OpenCPN reports a different MMSI 199400002 for the meteo from the South Bramble one 992351427. The same is true for the NAB tower some 15 miles SE of South Bramble. Just curious!

Thanks for the decode page, most helpful.

Roger

[Dirk--]

Hi Jasper,
got fresh samples from aishub.net (aggregated from 15 min. stream) for evaluation: https://github.com/Dirk--/AIS-testing/tree/main

[jvde-github]

I will picking up msg 8/6 again later this week. Thanks for sharing!

[Dirk--]

documentation 6/440/51 (AtoN status report):
https://scispace.com/pdf/the-extention-and-implementation-of-user-defined-ais-aton-3kakrv7rbi.pdf

[Dirk--]

documentation MSG:6/8 + DAC:412/413 (China)
https://www.mot.gov.cn/yijianzhengji/201611/P020161122566563693974.pdf (simplified Chinese, google translator works well)

[Dirk--]

documentation MSG:6/8 + DAC:200

• https://www.cesni.eu/wp-content/uploads/2024/11/ES-RIS25_signed_en.pdf Annex 15
• https://ris.cesni.eu/docs/File/618/inventory_of_inland_asm_edition_1_2.pdf

[jvde-github]

I sped up the online NMEA decoder (there was a short delay when pressing decoder). Also your local AIS-catcher now has a NMEA decoder: run with: -N 8100 decoder on

Still need to look at improving the workflow for message 6 and 8.

[g7ruh]

Sped up the decoder: yes very fast and no pause.

Works just as fast on the local AIS-catcher too.

Thanks, a most useful tool when testing and debugging.