SUUNTO AMBIT - Manual (Page 51)

ALTIMETER profile + altitude moving + weather change
If your Altimeter profile is on and the weather changes frequently while you
climb in altitude or go down in altitude, the device will give you incorrect
readings.
BAROMETER profile + altitude moving
If the Barometer profile is on for an extended period of time as you climb in
altitude or go down in altitude, the device assumes that you are standing still
and interprets your changes in altitude as changes in sea level air pressure. It
will therefore give you incorrect sea level air pressure readings.
Use example: Setting the altitude reference value
You’re on the second day of your two-day hike. You realize that you forgot to
switch from the Barometer profile to the Altimeter profile when you started
moving in the morning.You know that the current altitude readings given by
your Suunto Ambit are wrong. So, you hike to the nearest location shown on
your topographic map for which an altitude reference value is provided. You
correct your Suunto Ambit altitude reference value accordingly and switch
from Barometer to Altimeter profile. Your altitude readings are correct again.
9.2 Matching profile to activity
The Altimeter profile should be selected when your outdoor activity involves
changes in altitude (e.g. hiking in hilly terrain).
The Barometer profile should be selected when your outdoor activity does
not involve changes in altitude (e.g. soccer, sailing, canoeing).
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