Entering the Barometer Mode starts measurement, and displays the barometric pressure at your current location and a barometric pressure graph.

• After you enter the Barometer Mode, the watch takes readings about every five seconds for three minutes. After that, a measurement is taken about every two minutes or every five seconds.
  You can change the measurement interval, if you want.

• You can navigate between display screens by pressing (E).

• To retrigger measurement, press (C).

• To return to the Timekeeping Mode, hold down (D) for at least two seconds.