Calibrating the compass had to be done several times, and even then it would not show a correct reading. Even after calibration, distortion would appear on the screen often. Then, on top of all of that, it would not even mount to ANY part of my car. The windshield, dashboard, or the area next to the control panel. Granted, it was cold outside, but we get cold weather a lot in New York, and once the weather turned for the worst, it would probably fall off the windshield anyway. I would not recommend this to anybody looking for a compass for their car.