Suunto ESSENTIAL User Manual page 43

magnetic fields pull. Because magnetic North and true North are
not at the same location, you must set the declination on your
compass. The angle in between magnetic and true north is your
declination.
The declination value appears on most maps. The location of
magnetic North changes yearly, so the most accurate and up-to-
date declination value can be obtained from the internet (for
example the National Geophysical Data Center for the USA).
Orienteering maps, however, are drawn in relation to magnetic
North. This means that when you are using orienteering maps you
need to turn the declination correction off by setting the
declination value to 0 degrees.
To set the declination value:
1. In MENU, select COMPASS.
2. Turn the declination off or choose W (west) or E (east).
3. Set the declination value with [+] and [- Light].
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