Hold MENU, and select
Settings > Sensors & Accessories > Barometer.
Allows you to manually calibrate the barometer sensor.
Sets the time scale for the chart in the barometer widget.
Sets the rate of barometric pressure change that triggers a storm alert.
Sets the sensor used in watch mode. The
Auto option uses both the altimeter and barometer according to your movement. You can use the
Altimeter option when your activity involves changes in altitude, or the
Barometer option when your activity does not involve changes in altitude.