Suunto ELEMENTUM TERRA User Manual page 20

NOTE: Avoid any metal or magnetic fields as they disturb the calibration.
The calibration includes two sequences. The sequences follow each other
automatically, so read all the instructions before starting the calibration.
To calibrate the compass:
1. In view, keep [C] pressed to activate the calibration.
COMPASS
2. Keep the device level and rotate the compass until the outer rim segments
of the display are filled and you hear the confirmation sound. Text 'LEVEL'
is blinking on the display when the device is not leveled.
3. The tilt calibration starts automatically after a successful level calibration.
4. Keep the device tilted 90º until you hear the confirmation sound. The device
informs 'OK' when the calibration is successful.
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