1997 Lincoln Mark VIII Owner's Manual - Page 45

Factors Affecting Compass Accuracy Magnetic mounted devices (antennas, racks, etc.) should not be located on the front third of the vehicle roof. Placement of these devices near the compass will cause the compass to be inaccurate. If these devices are used, for improved accuracy, recalibrate the compass with the device(s) installed. Driving near power lines or large iron or steel structures can temporarily change the compass heading. Demagnetize the vehicle and recalibrate the compass if it remains inaccurate after driving near such objects. Figure 1 - Compass Menu Mode To abort this "compass menu" or any compass variation adjustment menu, press any control other than RESET or FUEL ECONOMY. Compass Adjustments Press and hold the COMPASS control, then press the RESET control. Next, release both controls. The display will show the "Compass Menu" (Figure 1). The letters on the left side of the arrows indicate the control to press to perform the adjustment indicated on the right side of the arrows, as shown in Figure 1. Variation Adjustment The variation adjustment is only needed if you travel outside your current zone (see Fig. 2). The following describes the method available for setting the variation adjustment: 40