Suunto Wristop Computer X10 Manuel D’Utilisation

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3.3.5. Reference altitude
To ensure that the altimeter shows correct readings, you first 
need to set an accurate reference altitude. To do this, go to a 
location whose altitude you have checked, for example, with 
the help of a topographical map, and set the reference altitude 
to match the map reading. 
NOTE: If you do not know the current altitude, go to the 
Position display and check the altitude with the GPS. The 
longer the GPS is on, the more accurate the altitude reading 
will be.
Setting the reference altitude
To set the reference altitude:
1.In the Set menu, Reference is the first menu item. Press 
ENTER to select it. The reference menu opens.
2.Altitude is the first menu item. Press ENTER to select it. The 
Altitude display opens. The previously set altitude is 
highlighted.
 
 
3.Change the altitude with UP/DOWN and press ENTER. The 
reference altitude is now set and you return to the Reference 
menu.