SUUNTO AMBIT3 SPORT - Manual (Page 21)

Paper maps point to true north. Compasses, however, point to
magnetic north – a region above the Earth where the Earth’s
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
www.magnetic-declination.com).
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. Keep [Next] pressed to enter the options menu.
2. Press [Next] to enter GENERAL.
3. Scroll to Compass using [Light Lock] and select with [Next].
4. Scroll to Declination with [Light Lock] and select with [Next].
5. Turn the declination off by selecting --, or select W (west) or E
(east).
6. Set the declination value with [Start Stop] or [Light Lock].
7. Press [Next] to accept the setting.
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