From the watch face, press , and select Settings > System > Compass.

Calibrate

Manually calibrates the compass sensor (Calibrating the Compass Manually).

Display

Sets the directional heading on the compass to letters, degrees, or milliradians.

North Ref.

Sets the north reference of the compass (Setting the North Reference).

Mag. Variation

Sets the magnetometer variation for the north reference.

Mode

Sets the compass to use a combination of GPS and electronic-sensor data when moving (Auto), GPS data only, or the magnetometer.