Casio WSD-F10 User Manual page 59

Before Using Altimeter
You can configure the watch's Altimeter to use smartphone position
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information (GPS) to correct altitude readings automatically. To use auto
altitude correction, you need to first perform the following operation
(Android smartphone only): Open "Settings", tap "Location", use the switch
to turn "Location" on, and then choose "High Accuracy" mode.
The altitude displayed by your watch is a relative value calculated based
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on barometric pressure. Because of this, measurements taken at different
times at the same location may produce different reading, due to changes
in temperature, humidity, barometric pressure, and other factors. Also note
that values displayed by the watch may be different from elevations
indicated for areas where you are located. When using Altimeter while
mountain climbing, it is recommended that you regularly correct the watch's
altitude measurement in accordance with the local altitude (elevation)
indications.
When taking altitude readings, keep the watch at as stable a temperature
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as possible. For better accuracy, strap the watch to your wrist for some time
before taking readings in order to allow the watch's temperature to stabilize.
Changes in pressure sensor temperature can cause measurement error.
Measurement Range and Units
Your watch measures altitude within the range of –700 to 10,000 meters (or
–2,300 to 32,800 feet), in units of 1 meter (or 5 feet).
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