Suunto AMBIT2 User Manual page 59

When the device is in
altitude with FusedAlti. This activates the GPS for a maximum of 15 minutes.
To search a new reference for barometric altitude with FusedAlti:
1. Keep [Next] pressed to enter the options menu.
2. Scroll to
ALTI-BARO
3. Scroll to Reference with [Light Lock] and enter with [Next].
4. Scroll to FusedAlti with [Start Stop] and select with [Next].
GPS is switched on and the device starts calculating altitude based on
FusedAlti.
mode, you can search a new reference for barometric
TIME
with [Light Lock] and enter with [Next].
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