Another idea...i have just bought a gps tracker for my car,It alerts you by text if your car is moved or goes out of a predetermined area,wires cut,unit turned off,ignition turned on without turning unit off etc It is Gps so sends you coordinates to view on google earth or autoroute.If your car is stolen,in theory you could follow it by texting the unit,get gps coordinates and have laptop in car following it with google earth

I bought one as my lockup is a couple of miles away,so can check on it at any time,although if moved it texts me.I had one of these on my old car and as a test i pushed my car out of lockup without turning the text alert off,my phone got a text alerting me before car was out of lockup heres link http://cgi.ebay.co.uk/GPS-TRACKER-CA...QQcmdZViewItem