Buick 1999 Park Avenue, Owner'S Manual

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To adjust for compass variance:
1. Press and hold the COMPASS button located at the
bottom of the mirror until a zone number appears in
the display.
2. Find your current location and variance zone number
on the following zone map.
3. Press the COMPASS button on the bottom of the
mirror until the new zone number appears in the
display. After you stop pressing the button, the
display will show a compass direction within a few
seconds. (This is the automatic calibration mode.
Drive in a circle to calibrate the mirror. See
“Compass Calibration” following.)
Compass Calibration
If the letter “C” should ever appear in the compass
window, the mirror may need calibration.
The mirror can be calibrated in one of two ways:
D Drive the vehicle in circles at 5 mph (8 km/h) or less
until the display reads a direction, or
D Drive the vehicle on your everyday routine.