Hold MENU, and select
Sensors & Accessories > Altimeter.
Allows you to manually calibrate the altimeter sensor.
Allows the altimeter to self-calibrate each time you use satellite systems.
Sets the mode for the sensor. The
Auto option uses both the altimeter and barometer according to your movement. You can use the
Altimeter Only option when your activity involves changes in altitude, or the
Barometer Only option when your activity does not involve changes in altitude.