anyone had problems with their gps not showing your proper location. I did get window tinting done but with a film that is not suppose to interfere. Also got a clean air sticker I installed on my windshield up by the rearview mirror. This lets you drive in the hov lanes in UT with only one person in the car. Couple of questions, where is the gps antenna and how can I check the signal strength? couldn't find it in the manual. Thx in advance for any help. Also, the car is 3 months old and this problem just started recently.