Suunto X9 Instruction Manual

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3.4.3. Declination
You can set the compass declination manually or let the GPS do it. The compass 
declination options are introduced in the table below:
Setting the compass declination manually
To set the compass declination manually:
1.In the Set menu, Declination is the first menu item. Press 
ENTER to select it. The On/Off/Auto field is activated.
2.Select On with UP/DOWN and press ENTER. The direction 
field is activated.
3.Select the desired direction with UP/DOWN and press 
ENTER. The degree field is activated. 
4.Change the degrees with UP/DOWN and press ENTER. 
The declination is now set and you return to the compass 
menu.
Off
Compass points to the magnetic north.
On
Compass points to the geographic north based on the manually 
set declination.
 
Use this when you know the exact declination of 
the location. Normally, you can find this on a topographic map. 
Auto
Compass points to the geographic north based on the declina-
tion from the GPS database value for the current location.
 
Use 
this when you do not know the exact declination of the area.