1998 Oldsmobile 88 Owner's Manual - Page 105
1998 Oldsmobile 88 Manual
Page 105 highlights
To adjust for compass variance: 0 Use the COMPASS button located at the bottomof the mirror. Press and hold the COMPASS button untila zone number appears in the display. Find your current location and variance zone number on the following zone map. Press theCOMPASS button on the bottom the of in the mirror until the new zone number appears display. After you stop pressing the button, the a display will show a compass direction within few seconds. (This is the automatic calibration mode. See Drive in a circle to calibrate the mirror. "Compass Calibration" following.) Compass Calibration If the letter"C" should ever appear the compass in window, the mirror may need calibration. The mirror can calibrated in one of two ways: be Drive the vehicle circles at 5 mph (8 km/h) or less in until the display readsa direction, or Drive the vehicle on your everyday routine.