You might look at Garmin. They have a number of GPS units that will work with their wireless camera. The camera runs on 2 AA batteries and using lithium batteries I get several days (over a week). I have mine on the front bumper to see the descending trails when off road, but the camera can be reversed based on whether it is facing forward or backward. The one I have is the BC 40, paired to a Drive Track 71, but there are a number of others that work with the BC 40. No wires, very easy installation, and camera can be quickly removed from the bracket to put inside your vehicle to prevent theft.