He didn’t sell his clients Arduinos + shields I hope. The SIM548C is a pretty cheap GPS+GSM/GPRS combo as well. Comes in SMT versions as well, and can be really cheap depending on how much ...

APRS Tracking System Flies Your Balloons. ... arduino shield, Atmel 328P, gps, gsm, ham radio. Post navigation. ... I typically will use Altitude-based beaconing and turn the packet rate up fairly ...