Casio WSD-F10 User Manual page 60

Altimeter Precautions
Do not use this watch while skydiving, hang gliding, paragliding, gyrocopter
●
flying, glider flying, or engaged in other activities where altitude changes
suddenly.
Altitude readings produced by this watch are not intended for special-
●
purpose or industrial level use.
In an aircraft, the watch measures the in-cabin pressurized air pressure, so
●
readings will not match altitudes announced by the crew.
Large changes in barometric pressure due to atmospheric conditions, large
●
temperature changes, or subjecting the watch to strong impact may make
correct readings impossible.
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