After looking at local prices of GPS stolen car finding systems (1000$ for installation + 50$/month) I thought it'd be much cheaper to make one.
So basically one needs Arduino with GPS shield/receiver and GSM modem. Sounds too simple. May there be something else?
Estimated costs: EM-406A GPS receiver 60$ (Sparkfun) GPS Shield 15$ (Sparkfun) +shipping Arduino board 20$ GSM SIEMENS TC35 SMS Module UART/232 29$ (ebay)
Total: ~130$ +battery, SIM, phone bill.
Am I missing anything?