When calibrated, the insert shown on the setup screen will point up when your Carv insert is pointing towards magnetic north.
Large quantities of metal or magnets can interfere with this. Inserts can be up to 10° out of alignment with each other due to these external factors.
External influences on direction are systematically corrected and do not affect final performance data.
If you see onscreen movement while the Carv insert is still, you should use the more menu in the top right (…) to perform a Zero Motion recording.