2010 Dodge Ram 1500 Regular Cab Owner Manual - Page 236

234 UNDERSTANDING YOUR INSTRUMENT PANEL 5. Complete one or more 360-degree turns (in an area free from large metal or metallic objects) until the "CAL" indicator turns off. The compass will now function normally. Compass Variance Compass Variance is the difference between Magnetic North and Geographic North. To compensate for the differences the variance should be set for the zone where the vehicle is driven, per the zone map. Once properly set, the compass will automatically compensate for the differences, and provide the most accurate compass heading. For the most accurate compass performance, the compass must be set using the following steps. Compass Variance Map 1. Turn the ignition switch ON. NOTE: Keep magnetic materials away from the top of 2. Press the UP or DOWN button until the System Setup the instrument panel, such as iPod's, Cell Phones, Lap(Customer-Programmable Features) menu is reached, tops and Radar Detectors. This is where the compass then press the SELECT button. module is located, and it can cause interference with the compass sensor, and it may give false readings.