2005 Buick Rendezvous Owner's Manual - Page 201

PRESS SET TO CALIBRATE COMPASS: After selecting your zone, press the MODE button and this will be displayed on the DIC. Press and hold the SET button and complete three 360 degree turns in an area free from large metal objects at a speed no faster than 5 mph (8 km/h). The following two messages will toggle in the display until you calibrate the compass: • DRIVE VEHICLE IN CIRCLE • CALIBRATING COMPASS When calibration is complete, the vehicle direction will be displayed instead of the C symbol. ZONE - - PRESS & HOLD SET TO CHANGE: This display mode will appear when you are manually calibrating the system. When the compass is being recalibrated for the first time, the zone symbol will be displayed. When the compass is being recalibrated any time after that, the current zone number for compass variance will be displayed in place of the zone symbol. Use the SET button to select the zone number from the graphic shown to select the current area of the country that you are driving in. 3-63