As regards GSM tracking, there was an office in F-10 Markaz where the guy was selling such a thing. According to what I understood, it was like buying a mobile for your car. The system required a sim and you had to recharge it like easy load. If you sms, the 'car' would reply telling its location. Next, you search the coordinates on Google and get your car. The system was hidden and would work whether the car was on or off.