In my E36 I used to have my sat radio receiver mounted off of the sunglass holder under the OBC. I removed the trim and discovered enouh holes for me to mount the arm that holds the unit in there, and with enough twists and turns, got it to work. However, this was sat radio, which is more of a set it and forget it type of thing. With a GPS, you may have to look down a few times while driving, which is dangerous.
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