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Suunto Spartan Sport Wrist HR Baro constantly measures absolute air pressure using the built-in pressure sensor. Based on this measurement and your altitude reference value, it calculates altitude or air pressure.
Keep the area around the air pressure sensor holes on the left-side of your watch free of dirt and sand. Never insert any objects into the holes as this may damage the sensor.
Swipe up or press the lower button to view the trend graphs for altitude and barometric pressure.
Tap on the display or press the middle button to switch between altimeter and barometer views.
Be sure to have your altitude reference value set correctly (see Altimeter). The altitude of your current location can be found from most topographic maps or major on-line map services such as Google Maps.
Changes in local weather conditions affect altitude readings. If local weather changes often, you should reset the altitude reference value regularly, preferably before starting your next journey.
While in the altimeter or barometer graph view, keep the middle button pressed for quick access to the outdoor settings where you can adjust the reference value.
Weather and altitude changes both cause a change in air pressure. To handle this, Suunto Spartan Sport Wrist HR Baro automatically switches between interpreting changes in air pressure as altitude or weather changes based on your movement.
If your watch senses vertical movement, it switches to measuring altitude. When you are viewing the altitude graph, it is updated with a maximum delay of 10 seconds.
If you are at a constant altitude (less than 5 meters of vertical movement within 12 minutes), your watch interprets air pressure changes as weather changes and adjusts the barometer graph accordingly.
Sport modes have their own alti-baro profile setting. You can change this setting in Movescount. The options are automatic, barometer only, or altimeter only.