Google Maps-compass backwards-maybe it's the car windshield?

In Google Maps, my compass is completely opposite- the blue arrow during directions shows that I am going backwards. I've rebooted, restored, recalibrated compass (many times), turned off and on compass calibration, and any other solution I've found in these forums. But now, my husband's phone has gone batty as well. I am now thinking it might be the car. Our car has a Solar Control glass windshield that contains a metal oxide. Does anyone else have this problem and have a windshield like this? Here is a list of cars with metal oxide- https://www.sunpass.com/specialWindshields

Any other solutions anyone else has found?