Negative Positive
Title: Not very accurate
Review: I had difficulty calibrating this in my car: it took three tries (i.e., six circles of a parking lot). It is mounted slightly above the dashboard in the center of the window. I have compared its reading with a GPS receiver in the car. Sometimes it is pretty accurate, but other times it shows "distortion" warning when remote from any possible sources of interference. Sometimes, but not always, driving down a perfectly straight road the compass heading will vary as much as 60 degrees, then jump back to the correct course. Other times it will be consistently 15 to 30 degrees either left or right of the true course. Maybe it is problem with my car, but if so, then this device is not really suitable for cars.
Is the review positive or negative? 