I had my first real one of these trigger last night: 1616938067 2021-03-28 13:27:47 53961 #158 C rx msg P AVehicle is being transported while parked - possible theft/flatbed (@0.000000;-?.??????) There are logs for a valid gps position ~6 minutes prior and 30 second after this. But here's the log (1 second after the alert) that shows the nmea sentence: 1616938068 2021-03-28 13:27:48 53968 #158 C rx msg L 0.000000,?.??????,0,9,1,1,0.0,0,0,0,0,0,0,0,12,0,0.0,0.0 That one is very interesting because the latitude is 0.0 but the reported longitude is really the latitude! The log essentially tells this story: A,B A,B 0,B 0,A A,B A,B Sort of looks like a simcom bug? (I don't want to post my location to the mailing list but I can send the raw log to interested parties.) Craig