Operation Guide 2872
About Barometric and Temperature Measurements
To take an altitude reading
•Barometric pressure and temperature measurement operations are performed as soon as you enter the Barometer/Thermometer Mode. After that, barometric pressure and temperature measurements are taken every five seconds.
•The barometer automatically takes measurements every three hours (starting from midnight), regardless of what mode you are in. The results of these measurements are used for positioning indicators in the barometric pressure indicator display area.
•You can also perform a barometric pressure and temperature measurement at any time by pressing E in the Barometer/Thermometer Mode.
Barometer and Thermometer Precautions
• The pressure sensor built into this watch measures changes in air |
pressure, which you can then apply to your own weather predictions. It is |
not intended for use as a precision instrument in official weather prediction |
or reporting applications. |
Altitude indicator Temperature
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Altitude
Timekeeping Mode time
Pressing D in the Timekeeping Mode or in any of the other sensor modes enters the Altimeter Mode and automatically starts altitude measurement.
•It can take up to four or five seconds for the altitude reading to appear after you enter the Altimeter Mode.
•The Altimeter Mode screen also displays the current temperature. See “Barometer/ Thermometer” for more information.
•During the first three minutes after entering the
Altimeter Mode, the
indicator flashes on the display and measurements are taken every five
seconds. After that, the
indicator disappears as measurements are taken every two minutes.
• Sudden temperature changes can affect pressure sensor readings. |
• Temperature measurements are affected by your body temperature (while |
you are wearing the watch), direct sunlight, and moisture. To achieve a |
more accurate temperature measurement, remove the watch from your |
wrist, place it in a well ventilated location out of direct sunlight, and wipe all |
moisture from the case. It takes approximately 20 to 30 minutes for the |
case of the watch to reach the actual surrounding temperature. |
Altimeter
A
Important!
•This watch estimates altitude based on air pressure. This means that altitude readings for the same location may vary if air pressure changes.
•This watch employs a semiconductor pressure sensor, which is affected by temperature changes. Make sure that the watch is not being exposed to temperature changes while you are taking altitude measurements.
•To avoid the effect of sudden temperature changes on measurement, wear the watch so it is in direct contact with your wrist during measurement.
•Do not rely upon this watch for altitude measurements or perform button operations while engaging in sports where there are sudden altitude changes, while sky diving, hang gliding, or paragliding, or while riding a gyrocopter, glider, or any other aircraft.
•Do not use this watch for measuring altitude in applications that demand professional or industrial level precision.
•Remember that the air inside of a commercial aircraft is pressurized. Because of this, the readings produced by this watch will not match the altitude readings announced or indicated by the flight crew.
How the Altimeter Works
With the Preset Values (No Reference Altitude)
•The watch measures the air pressure at your current location and uses the
•Pressing D causes the measurement operation to restart from the beginning of the cycle described above.
•Altitude is displayed in units of 5 meters (20 feet).
•The measurement range for altitude is
•The measured altitude may be a negative value in cases where there is a reference altitude value set or because of certain atmospheric conditions.
•The displayed altitude value changes to xxxxx meters (or feet) if a measured altitude falls outside the measurement range. The altitude value will be displayed again as soon as the measured altitude is within the allowable range.
•You can change the unit of measurement for the displayed altitude values between meters (m) and feet (ft). See “To change the altitude unit”.
Altitude Indicator
In the Altimeter Mode, the altitude indicator shows the current altitude reading in meters (m). As shown in the illustration below, the altitude indicator is divided into two zones: one for 0 to 999 meters, and one for 1000 to 10,000 meters.
Though you can specify either meters or feet for the watch’s altitude measurements, the altitude indicator always shows altitude in meters.
1000+ meter zone
The above altitude indicator indicates an altitude of approximately 4,340 meters.
•The
•The 1000+ meter zone indicates altitudes in
Setting a Reference Altitude
After you set a reference altitude, the watch adjusts its
With a Reference Altitude
•If you set a reference altitude, the watch uses that value when calculating altitude based on air pressure.
•To determine the height of a tall building, set the reference altitude to 0 on the ground floor. Note, however, that you may not be able to get a good reading if the building is pressurized or
•When mountain climbing, you can set the reference value in accordance with a marker along the way or altitude information from a map. After you do this, the altitude readings produced by the watch will be more accurate than they would be without a reference altitude.
B
A
400
available during your climb.
To set a reference altitude
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| 1. In the Altimeter Mode, hold down A until |
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appears.
2. Press D (+) or B
• You can set the reference altitude within the range of
• Pressing D and B at the same time returns to OFF(no reference altitude), so the watch performs air pressure to altitude conversions based on preset data only.
3. Press A to exit the setting screen.
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