To perform a compass calibration go to menu/SYSTEM/CAL COMPASS.
The compass calibration takes approximately 2 minutes. Within this 2 minutes move the SYMBIOS HANDSET in a "Figure 8" in front of you.
After calibration check the compass heading. If the compass heading is incorrect, redo the calibration process. If the compass heading is still incorrect, there might be magnetic disturbances at your location. Go to a different location (outside a building and distant from electric power lines) and redo the calibration.