If you want your Car tracking system to be hidden and out of view, you must use a Hardwired GPS Vehicle Tracker. A hardwired GPS tracker can also be installed on the outside of the vehicle. This can keep the device even more discreet. In the case of a hardwired tracker, the Vehicle Tracking Device draws its power from the car’s main battery. For this it’s best to ask a technician to connect the device to its power supply.