2005 Dodge Dakota Owner Manual - Page 132
2005 Dodge Dakota Manual
Page 132 highlights
132 UNDERSTANDING THE FEATURES OF YOUR VEHICLE To Put Into a Calibration Mode Turn on the ignition and set the display to "Compass/ Temperature." Press and hold the RESET button to change the display between VAR (compass variance) and CAL (compass calibration) modes. When the CAL symbol is displayed complete one 360 degree turn in an area free from large metal objects or power lines. The CAL symbol will turn off and the compass will function normally. Compass Variance is the difference between magnetic north and geographic north. In some areas of the country, the difference between magnetic and geographic north is great enough to cause the compass to give false readings. If this occurs, the compass variance must be set according to the Compass Variance Map.