Suunto G9 Instruction Manual page 37

Setting the reference altitude manually
To set the reference altitude manually:
1. In the Set menu, Altitude is already the first menu item.
Short press Enter to select it.
2. Scroll to manual and short press Enter . The reference
altitude is displayed.
3. Change the reference altitude with the arrow buttons
and short press Enter to confirm the selection. The
reference altitude is now set.
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