SUUNTO G9-3 - Manual (Page 36)

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3.3.2. Altitude:
With this function you can set the reference altitude. You can set it either with the GPS
or manually.
NOTE: If the GPS is not activated, you have to set the reference altitude manually.
Manual setting can also be selected if the GPS is on.
NOTE: Since the GPS altitude is the least accurate of the GPS measurements, the
reference altitude is calculated as the average of a series of fixes during the GPS
start.
Setting the reference altitude with the GPS
To set the reference altitude with the GPS:
1. Make sure the GPS is turned on.
2. In the Set menu,
Altitude is already the first menu item.
Short press Enter to select it.
3. Scroll to Sync and short press Enter . The On/Off field
is activated.
4. Change Sync to On or Off with the arrow buttons and
short press Enter .
5. Press Stop/Cancel to return to the Function menu.