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Altimeter, Barometer, Thermometer
Altimeter: (In the center, expressed in meters or feet) Indicates the altitude
above sea level.
The value of the height above sea level is calculated based on atmospheric
pressure.
Warning: the accuracy of the altitude measurement depends directly on the
atmospheric pressure and humidity present in the sensor location. Therefore, in
the event of bad weather, or after a dive, the error could be as much as +/-80m.
Thermometer: (At lower left, expressed in °C or °F): Indicates the temperature
of the JACK case.
The temperature measured by JACK is the temperature of the watch case itself.
Therefore, when worn on your wrist it will measure a temperature higher than
the outside temperature. To measure the ambient temperature, remove the
watch from your wrist and wait at least 5-6 minutes. The temperature reading
will be accurate in the water after 3-4 minutes.
Barometer: (At lower right, expressed in millibars) Indicates the atmospheric
pressure (the pressure present at any point in earth's atmosphere).
The barometer reading is used to automatically adapt the decompression
calculation for dives at altitude. Therefore it isn't necessary to enter the dive
altitude in the settings (which the calculator would use to calculate a hypothetical
atmospheric pressure to use in adapting the decompression calculation),
because JACK automatically detects the true barometric pressure regardless
of the altitude.
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