2003 Chevrolet TrailBlazer Owner's Manual - Page 121
2003 Chevrolet TrailBlazer Manual
Page 121 highlights
Compass Operation Press the on/off button once to turn the compass on or off. There is a compass display in the window in the upper right corner of the mirror face. The compass displays a maximum of two characters. For example, "NE" is displayed for north-east. Compass Calibration Press and hold the on/off button down for nine seconds to activate the compass calibration mode. "CAL" will be displayed in the compass window on the mirror. The mirror can be calibrated in one of two ways: Compass Variance The mirror is set to zone eight upon leaving the factory. It will be necessary to adjust the compass to compensate for compass variance if you live outside zone eight. Under certain circumstances, such as during a long distance cross-country trip, it will be necessary to adjust for compass variance. Compass variance is the difference between earth's magnetic north and true geographic north. If not adjusted to account for compass variance, your compass could give false readings. To adjust for compass variance, do the following: 1. Find your current location and variance zone number on the map. D Drive the vehicle in circles at 5 mph (8 km/h) or less until the display shows "CAL," or D drive the vehicle on your everyday routine. (This method may take longer to calibrate). 2-52
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