SUUNTO Vyper Air - Manual (Page 31)

First the compass is level calibrated and after a successful level calibration, the com-
pass is tilt calibrated. The tilt calibration compensates for tilting the compass in any
direction in angles of up to 45°.
Strong electromagnetic fields, such as power lines, stereo speakers, and magnets
can affect the compass calibration. Therefore, it is advisable to calibrate the compass
if your Suunto Vyper Air has been exposed to these fields.
NOTE
When traveling overseas, it is recommended that you recalibrate
the compass at the new location before using it.
NOTE
Remember to hold the Suunto Vyper Air level during the level
calibration process. A deviation of ± 5° is allowed in any direction
from the horizontal plane during level calibration.
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