1998 Buick Park Avenue Owner's Manual - Page 120

3. Press the COMPASS button on the bottom of the minor until the new zone number appears in the display. After you stop pressing the button, the display will shcw 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.) : ~ .QEbT&GR ~ ~ ~ ; ~ If the letter shsuM ever appearin tire compass window, the mirror may need calibration. T 9 ' The mirror can be calibrated in one of two ways: Drive the vehicle in circles at 5 mph (8 kmh) less n/a or until the display reads a direction, OF @ Drive the vehicle on your everyday routine.