Your device uses an internal barometer to measure elevation changes as you climb floors. A floor climbed is equal to 3 m (10 ft.).
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Locate the small barometer holes on the back of the device, near the charging contacts, and clean the area around the charging contacts.
The barometer performance may be affected if the barometer holes are obstructed. You can rinse the device with water to clean the area.
After cleaning, allow the device to dry completely.
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Avoid holding handrails or skipping steps while climbing stairs.
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In windy environments, cover the device with your sleeve or jacket as strong gusts can cause erratic readings.