The barometer features include altitude, incline, decline, ascent and descent. Altitude is measured with an atmospheric air pressure sensor that converts the measured air pressure into an altitude reading. Ascent and descent are shown in meters/feet.
Barometric altitude is automatically calibrated two times via GPS during the first minutes of a session. In the beginning of a session before calibration, altitude is only based on barometric air pressure that can at times be inaccurate depending on the conditions. Altitude data is post-corrected after calibration, so any inaccurate readings seen during the beginning of a session are automatically corrected afterwards, and the corrected data can be viewed in the Flow web service and app after your session after syncing your data.
To get the most accurate altitude readings, it is recommended to always manually calibrate altitude whenever a reliable reference, such as a peak or a topographic map is available or when at sea level. Altitude can be manually calibrated from the fullscreen altitude training view. Press OK to set the current altitude.
Mud and dirt on the device can cause inaccurate altitude readings. Keep your device clean to make sure the barometric altitude measurement works properly.