- Location
- In the islands
after installing an overhead console. The tempeture works good but the compass do not. If I remove it and let it sit on the seat it works better in that it it shows the direction I am going but when mounted inits correct location it do not. Where does this thing get signal from? I assume it is not from GPS; or is it? For a magnetic compass which I am inclined to believe, then it is correct. I need to be calibrated. How is this done? How much of the head liner need to be removed? TIA.