The Orca Core contains a Motion Processor and a Magnetic Compass. Both sensors require calibration before they can be used.
Orca will automatically notify you if a calibration is needed when you connect to your Core.
If you have dismissed this notification or you want to recalibrate, open Main Menu > My Boat and press Calibrate Compass to begin calibration.
Calibration takes typically 3 minutes and requires:
Sufficient space to make a 360-degree turn at a slow turning rate
You must recalibrate your Core if you move it or if you install any electronic devices in the vicinity of the Core. You should also re-calibrate your Core at the beginning of every season.