Suunto D6 User Manual page 31

HOLD THE
DEVICE LEVEL
AND SLOWLY
ROTATE 360°.
If the calibration fails several times in a row, it is possible that you are in an area with
sources of magnetism, such as large metal objects, powerlines or electric appliances.
Move to another location and try to calibrate the compass again. If the calibration
continues to fail, contact an authorized Suunto service center.
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