SUUNTO D9tx - Manual (Page 34)

Explanation Symbol
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 D9tx 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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