Volvo 2007 S80 Owner's Manual page 135

The compass may need to be calibrated if, for example, the vehicle is driven into a new magnetic zone. The characters
CAL are shown in the mirror's display if calibration is necessary.
1. Stop the vehicle in a large open area, away from traffic.
2. Start the vehicle.
3. Using a pen or similar object, press and hold the button on the rear side of mirror until CAL is shown again (after
approx. 6 seconds).
4. Drive as usual. CAL disappears from the display when calibration is complete. Alternative calibration method: Drive
slowly in a circle at a speed of no more than 5 mph (8 km/h) until CAL disappears from the display when calibration
is complete.
Selecting a magnetic zone
The earth is divided into 15 magnetic zones. The correct zone must be selected for the compass to work correctly.
1. Put the ignition in mode II.
2. Using a pen or similar object, press and hold the button on the rear side of mirror for at least 3 seconds. The number
for the current area will be shown.
3. Press the button repeatedly until the number for the required geographic area (1-15) is shown.
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04 Comfort and driving pleasure
Compass
4. The display will revert to showing the compass direction after several seconds.