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Altimeter - Casio 3069 Manual

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The watch's altimeter uses a pressure sensor to detect current air pressure,
which is then used to estimate the current altitude based on ISA (International
Standard Atmosphere) preset values. You also can specify a reference
altitude, which the watch will use to calculate your current altitude based on
the value you specify. Altimeter functions also include storage of
measurement data in memory.
You also can measure the altitude differential (change) from a specific
reference altitude. Specifying the reference altitude is as simple as pressing a
single button to reset the reference altitude to zero.
• This watch estimates altitude based on air pressure. This means that
altitude readings for the same location may vary if air pressure changes.
• The semiconductor pressure sensor used by the watch for altitude
measurements is also affected by temperature. When taking altitude
measurements, make sure the watch is not subjected to temperature