GPS Ground Speed Zero when platform is moving

[esa.attia]

I also found this thread…

Not sure if the problem is related to mine

Speed is missing in RMC sentence

Hello, I have been using Reach with a program to autosteer a farm tractor. The accuracy is phenomenal and I can get great results with the position from reach (and with the autosteer software), but sometimes the program “freezes” and I noticed it was saying that the groundspeed was zero. At first I though it was a problem with the software or the tablet that is running it, however I noticed that the problem is in the NMEA sentence. I still get new sentences, valid ones but the RMC sentence, i…