The National Marine Electronics Association (NMEA) controls the standard for encoded AIS messages. The Spire Sense TCP Feed sends encoded AIS messages in the NMEA 0183 v4.0 format with a timestamp TAG block as a prefix.

Some example messages from the Spire Sense TCP Feed are below:

\c:1503079500*55\!AIVDM,1,1,,B,C6:b0Kh09b3t1K4ChsS2FK008NL>`2CT@2N000000000S4h8S400,0*50

\c:1503079517*53\!AIVDM,1,1,,B,16:Vk1h00g8O=vRBDhNp0nKp0000,0*40

\c:1503079517*53\!AIVDM,1,1,,B,18155hh00u0DEU`N1F@Bg22R06@D,0*60

\c:1503079517*53\!AIVDM,1,1,,A,83aGFQ@j2ddtM<M>H1b@g?b`7mL0,0*55

\c:1503079517*53\!AIVDM,2,1,9,A,53m@FJ400000hT5<0008E8q@TpF000000000000T2P3425rg0:53kThQDQh0,0*48

\c:1503079517*53\!AIVDM,2,2,9,A,00000000000,2*2D

\c:1503079516*52\!AIVDM,1,1,,A,13oP50Oi420UAtPgp@UPrP1d01,0*1A

\c:1503079516*52\!AIVDM,1,1,,B,B3mISo000H;wsB8SetMnww`5oP06,0*7C

\c:1503079517*53\!AIVDM,2,1,0,B,53aIjwh000010CSK7R04lu8F222222222222221?9@<297?o060@C51D`888,0*1B

A detailed breakdown of this format can be found on the NMEA website in their NMEA 0183 V4.00 presentation.

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