SUUNTO Vyper Air - Manual (Page 32)

To calibrate the compass:
HOLD THE
DEVICE LEVEL
AND SLOWLY
ROTATE 360°.
HOLD THE
DEVICE STILL
AND SLOWLY
TILT 90°
VERTICALLY.
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, power lines 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.
Declination
You can compensate for the difference between true north and magnetic north by
adjusting the compass declination. The declination can be found, for example, from
sea charts or topographic maps of the local area.
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