Hi!
I have a question about NULL values seen in position_data4. It seems like sometimes there is a "rawmsg" but the corresponding "lat" "lon" and "alt" are filled in as NULL.
Ex): rawmsgmintimemaxtimemsgcounticao24nicsupplahcrnicsurvstatusnicsupplboddbaroaltlatlonaltnicsupplcgroundspeedgsresolutionheadingtimeflagsurfacehourserialmintime.1maxtime.10 8facb89c5937664328c9a104fcd0 40:18.740:18.71 acb89c false 185.290 false true true NULL NULL NULL false NULL NULL NULL false false 1.67E+09-1.4E+0940:18.740:18.7
I'm wondering what causes the result to be NULL? I tried globally unambiguous CPR decoding using the given "rawmsg", it seems like the "rawmsg" can be decoded and can pass the CRC check. I'm curious about what are the common cases corresponding to have a NULL in "lat" "lon" and "alt".
Thanks!
