[. . . ] Your Detector Intro Operation Important Compass Information for the XRS 9675 Customer Warranty Assistance Calibrating Your Compass The compass in your radar detector must be calibrated before you use it to give accurate directions. [. . . ] It does not matter what direction your vehicle is pointing when you start the circles, which direction you go to make the circles, and it does not have to be exactly two circles. Four three-point turns, two small squares, or any two complete loops will work as well as two circles. It does not matter what size the circles are, if your speed is constant, or how fast you make the circles (but less than two minutes). Will I need to calibrate the compass every time I use my radar detector? No. The compass electronics holds the information about the magnetic fields made by your vehicle. However, for best results, you should mount the detector in exactly the same location every time you use it. When you remove the detector from your windshield, it is best to leave the mounting bracket on your windshield so that when you replace the detector it is mounted, again, in exactly the same place. If you decide to relocate your detector to a different place (either on the windshield or on the dash), it is best to calibrate the compass again. My compass sometimes seems to give a wrong direction ­ what is wrong? If your compass is unable to detect the magnetic field of the Earth (used to determine the direction), it cannot give the correct reading. This may happen if you are under a bridge, inside a parking garage, or inside any enclosure or building that is constructed with metal framework. [. . . ] There is no need to calibrate your compass again after this. Printed in China Part No. [. . . ]