When And Where Should The Compass Be Calibrated - di-GPS Mini 3-DC series User Manual

WHEN AND WHERE SHOULD THE COMPASS BE CALIBRATED

Basically there is no need to do the calibration again once the calibration was done before. However,
the accuracy of digital compass heading can be affected by magnetic or other environmental
interference, including interference caused by strong magnetic, RF field, high voltage electricity, etc.
The compass may need to be calibrated from time to time.
When should the compass be calibrated :-

First time use ;

when the M3-DC GPS goes through a place with stronger magnetic field ;

whenever you think the accuracy of digital compass heading is distorted.
Where should the compass be calibrated:-

Outdoor areas such as open-sky parking lot.

Areas free from magnetic interference caused by strong magnetic, RF field, high voltage
electricity, etc.

Avoid magnetic metallic environment or mineral deposits, such as your car's dashboard
motor, iron desk, iron partition, speaker, RF antenna, WiFi Router, mobile phone, high
voltage cable, etc.
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