SUUNTO D6 - Manual (Page 29)

Explanation Symbol
You are 120 (or 240) degrees from the locked bearing
4.4.3. Compass settings
You can define the compass settings (declination and calibration) when in COMPASS
mode:
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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