The device can be tracked via a web interface, and has many more features. $250 from Xacttechnology. GPS Tracking devices only do one thing: broadcast their own GPS location at all times, period. It can also be left in an OFF state and turn itselfON upon a shock or a pull on its handle. Xact goes one step beyond. For example, they could use its GPS or its GPRS datalink for their computer. The best one: no subscription fee. First of all, users can benefit from its hardware in conjunction with other devices.