Can I ask WHY you want something like that?
Most cars that are stolen are taken for two reasons. To joyride, or to strip them down. And lets get it all out there... someone "joyriding" in your car is not good, trust me ive seen it alot of times ~ running over curbs, leaving rubber marks anywhere they can, abusing the car because hey ~ it aint theirs. And how a joyride usually ends is they hit something somewhere and end up leaking some important fluid (take your pic) or, for fear of getting caught will dump it in a river/lake...
Now, lets say the person that steals your car is going to deliver it to a chop shop. First off, suppose they manage to NOT short out the GPS unit. Your watching some long movie at the theatre, you come out 2 hours later and the car is gone... do you know how car you can get in a car in two hours? The theif could already have the car at the chop shop and once the car starts getting taken apart it will be found and taken out... therefor, no more tracking...
...do you REALLY want your car back from either situation? The odds are stacked against you in either case. So why not just take the extra money and put it towards full coverage on your car. :smoka: