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The Elevation Reading on My Forerunner 945 LTE Is Wrong
The elevation reading you see comes from a barometric altimeter sensor inside the watch. This sensor detects barometric pressure changes in order to determine current elevation at a given point. If you believe the elevation reading from your watch is incorrect, review the following information to help troubleshoot and fix the problem.
Weather Changes Can Affect Sensor Accuracy
Weather can contribute to an incorrect reading. This includes:
An incoming or departing low or high-pressure system
This can cause your starting elevation reading to be too high or low. You should manually calibrate to a known elevation in this case. The elevation gain/loss during the recorded activity is typically not affected.
A windy day
Wind can affect the sensor causing an inaccurate reading. If you are going to record an activity outdoors when it is windy we suggest wearing the sleeve of a shirt or coat over the watch.
Clean the Sensor Port on the Watch
A blocked or clogged sensor port can lead to:Wrong elevation or barometer readings
Incorrect Floors Climbed credit
To clean the sensor, locate the port on the back of the watch (it will be a small hole at the 6 o'clock position). You can rinse the port with water or you can also soak the watch in water for 5 minutes, agitating it every minute to help breakdown and remove any debris, such as sweat crystals or skin cells. After cleaning and/or soaking, allow the watch to dry completely.
IMPORTANT: Do not insert anything into openings on the watch (including canned air) as this can damage the internal sensor.
Calibrate the Sensor
With proper calibration the watch can achieve an accuracy of +/-50 feet at any given point. Use the information below to determine which calibration options are best for you.