2. Calibrate the Compass: a) Drive to an open, level area away from large metallic objects or structures. b) For optimum results, switch off all nonessential electrical accessories (A/C, blower, wipers, defrost, etc.) and close all doors. c) Press and hold the left button for approximately 3 seconds until the word “CAL” is visible in the display, then release the button. This puts the compass into Calibration mode. “CAL” and a direction will be displayed. d) Drive slowly in a circle (about two or three times) until “CAL” disappears from the display and then verify compass accuracy. http://www.drive.subaru.com/SubaruDrive-Sum02/AutoDim.htm