Altimeter and Barometer Settings
From the watch face, hold 
, select Watch Settings > System > Altimeter & Barometer.
Calibrate: Manually calibrates the altimeter and barometer sensor.
Auto Cal.: Self-calibrates the sensor each time you use satellite systems.
Sensor Mode: 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.
Elevation: Sets the units of measure for elevation.
Pressure: Sets the units of measure for pressure.
Barometer Plot: Sets the length of time to show on the graph for the barometer glance.
Calibrating the Barometric Altimeter
Your watch was already calibrated at the factory, and the watch uses automatic calibration at your GPS starting point by default. You can manually calibrate the barometric altimeter if you know the correct elevation.
- From the watch face, hold .
- Select Watch Settings > System.
- Select Altimeter & Barometer.
- Select Calibrate.
- Select an option:
- To enter the current elevation manually, select Enter Manually.
- To calibrate automatically from your GPS location, select Use GPS.