SUUNTO AMBIT3 PEAK - Manual (Page 17)

Changes in local weather conditions will affect altitude readings. If
local weather changes often, it is advisable to reset the current
altitude reference value frequently, preferably before starting your
journey when the reference values are available. As long as the
local weather stays stable, you do not need to set reference values.
To set the sea level pressure and altitude reference values:
1. Keep [Next] pressed to enter the options menu.
2. Scroll to ALTI-BARO with [Light Lock] and enter with [Next].
3. Scroll to Reference with [Light Lock] and enter with [Next].
4. The following setting options are available:
• FusedAlti: GPS is switched on and the watch starts calculating
altitude based on FusedAlti.
• Manual altitude: Set your altitude manually.
• Sea level pressure: Set the sea level pressure reference value
manually.
5. Set the reference value using [Start Stop] and [Light Lock].
Accept the setting with [Next].
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