I once owned a PNI Radar detector with a compass feature. Mine had to be calibrated by actually driving in clockwise and then counter-clockwise circled (three times each if I recall correctly. Check your manual for a similiar procedure. If you can find one, pick up a Uniden GPSRD unit. These work off the Defense Department's satellites and never need any calibration. They also track your speed from space and displays it on the detector. You can also mark locations,and get latitude/longitude information whenever you need it as well as directions to anywhere in the US. VERY COOL DEVICE! So cool, I bought one for each vehicle... however one was recently stolen.:( Hope this information helps you out.
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