User Guide

56
Absolute air pressure and known sea level air pressure = Altitude
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.
9.3 Getting incorrect readings
ALTIMETER profile + standing still + weather change
If your Altimeter profile is on for an extended period of time with the
device in a fixed location while the local weather changes, the device
will give incorrect altitude readings.
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.