AIS Sentence

[GeGaX]

Hi Michael 😉, (Sorry not too present lately)

I am told about a concern about decoding AIS sentences

By following the doc, we see that the message must not be more than 168 bits or the messages are 174 bits so the decoder crashes

Which doc did you follow for the coding of AIS sentences?

=> DOC

[GeGaX]

Hi Michael 😉, One of my teammate has just found the bug on the AIS which works on "lax" software but which is in error on those which respect the standard.

    function formatAIVDM_AIS_msg5 (mmsi, uinfo) {
        var s = "AIVDM";
        s += "," + "1";                                    // number of fragment
        s += "," + "1";                                    // fragment number
        s += "," + "";                                     // message id
        s += "," + "B";                                    // Radio Canal
        s += "," + formatUtilAIVDM_AIS_msg5(mmsi, uinfo);  // payload
        s += ",4"                                          // padding    HERE THE VALUE IS " 2 " not " 4 " 
        return s;
    }