2010 Hummer H3T Owner's Manual - Page 118

5-4 Instruments and Controls To adjust for compass variance: 1. Find your current location and variance zone number on the following zone map. 3. Keep pressing O until the desired zone number displays. Release the button. After four seconds, the new zone number locks in and the compass display returns. Compass Calibration The compass may need to be calibrated if CAL is not displayed and the compass requires calibration. Press and hold O until CAL displays in the compass window, then release the button. The compass is now in calibration mode. . Clock The clock can be set with the ignition on or off. Use the H and M buttons located on the lower left side of the radio. To set the clock: 1. Press and hold H until the correct hour and AM or PM displays. 2. Press and hold O for six seconds until ZONE displays. Release the button. The compass is now in zone mode. 2. Press and hold M until the correct minute displays. Press DISP (Display) to display the time while the ignition is turned off. Drive the vehicle in circles at less than 8 km/h (5 mph) until CAL is no longer displayed in the compass window. Then continue to drive to make sure all eight directions are available. Drive the vehicle under normal operating conditions. . Compass Variance The mirror is set to zone eight. If you do not live in zone eight or drive out of the area, the compass variance needs to be changed to the appropriate zone.