Symbol Explanation

You are 180 degrees from the locked bearing

You are 120 (or 240) degrees from the locked bearing

4.4.3. Compass settings

You can define the compass settings (Calibration, Declination and Timeout) in the COMPASS mode:

Calibration

Because of changes in the surrounding magnetic field, the Suunto D6i electronic compass occasionally needs to be re-calibrated. During the calibration process, the compass adjusts itself to the surrounding magnetic field . As a basic rule, you should calibrate the compass whenever it does not seem to operate properly, or after replacing the dive computer's battery.

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Suunto D6I manual Compass settings, Calibration