The simplest solution would be to get one of the license plate frames with a camera and use the RCA video out and plug it into the aux port on the Nav (in the center console). If that source can run while the car is moving, then you would have an awesome rearview camera that could stay on all the time.
The problem with using the rear fog light position is that it is a very low point that would not give you a good angle on the ground behind you.
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