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Interior Mirror & Compass

Calibrating the compass

Setting the compass Variations in the earth's magnetic field cause changes to occur in the compass reading as the vehicle is driven from one set zone to another. However, it should be noted that magnetic variation between adjacent zones is only 4 degrees, and for most motoring situations, resetting the compass should only be necessary if the vehicle has crossed more than one zone, or calibration was carried out in any zone other than zone 8.


Turn the starter switch to position II. The mirror display should show the letter ‘C’.

If 'C' is not displayed, use a ballpoint pen or similar probe to press the button on the underside of the mirror for six seconds until ‘C’ is displayed. The button can then be released and the compass calibrated as follows:

Calibrate the compass by driving the vehicle in circles at 5 mph (7 km/h) or less (two circles should be sufficient) until the mirror display shows a direction (‘N’, ‘NE’, ‘E’, ‘SE’, ‘S’, ‘SW’, ‘W’ or ‘NW’).

Alternatively, the compass will eventually calibrate itself during normal vehicle use, but depending upon the type of driving that is undertaken, this may take considerably longer.

Note that the precise points at which the set zones change cannot be accurately plotted and that drivers situated in an area where zones merge should not need to reset the compass every time the vehicle crosses from one to another.

To set the compass:

  • 1.

    Identify the appropriate zone for your location (see the map that follows).

  • 2.

    Turn the starter switch to position II.

  • 3.

    Using a ballpoint pen or similar probe, press and hold the button on the underside of the mirror until a zone number appears in the display. This will take approximately 3 seconds (note that the compass automatically defaults to zone 8).

  • 4.

    Release the button, then continue pressing and releasing the button alternately until the required zone number appears in the display.

  • 5.

    Once the set zone has been selected, the display reappears (after 10 seconds approx.), and the compass is correctly set for the required zone.


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