Casio WSD-F20X User Manual page 31

Using Altimeter
Altimeter has a color display Altimeter Screen (left), a color display Altitude
Graph Screen (center), and a monochrome display (right).
All of the screens show the altitude at your current location.
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The Altitude Graph Screen shows a graph of altitude changes over the past
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24 hours, along with the low altitude (Min) and high altitude (Max) during
that period.
The upper part of the monochrome display shows a graph of altitude
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changes over the past 23 hours.
Your watch measures altitude within the range of –700 to 10,000 meters (or
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–2,300 to 32,800 feet), in units of 1 meter (or 5 feet).
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