Operation Guide 3135 3206
Note that if there are sudden changes in barometric pressure or temperature, the graph line of past measurements may run off the top or bottom of the display. The entire graph will become visible once barometric conditions stabilize.
The following conditions cause the barometric pressure measurement to be skipped, with the corresponding point on the barometric pressure graph being left blank.
•Barometric reading that is out of range (260 hPa/mb to 1,100 hPa/mb or 7.65 inHg to 32.45 inHg)
•Sensor malfunction
Barometric Pressure Differential Pointer
This pointer indicates the relative difference between the most recent barometric pressure reading indicated on the barometric pressure graph, and the current barometric pressure value displayed in the Barometer/ Thermometer Mode.
•Pressure differential is indicated in the range of ±5 hPa, in
•The barometric pressure differential pointer is not displayed when the displayed current barometric value is outside of the allowable measurement range (260 to 1,100 hPa).
•Barometric pressure is calculated and displayed using hPa as the standard. The barometric pressure differential also can be read in inHg units as shown in the illustration.
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Barometric pressure | hPa values | measured pressure | |||||
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Pressure differential | Current pressure less | |
examples in the | ||
than most recent | ||
illustration are indicated | ||
measured pressure | ||
in 3 hPa/0.1 inHg steps. | ||
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About Barometric and Temperature Measurements
•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.
•You also can perform a barometric pressure and temperature measurement at any time by pressing B in the Barometer/Thermometer Mode.
Altimeter
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.
Important!
•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 also is affected by temperature. When taking altitude measurements, make sure the watch is not subjected to temperature changes.
•To avoid the effect of sudden temperature changes during measurement, keep the watch on your wrist in direct contact with your skin.
•Do not rely upon this watch for altitude measurements or perform button operations while sky diving, hang gliding, or paragliding, while riding a gyrocopter, glider, or any other aircraft, or while engaging in any other activity where there is the chance of sudden altitude changes.
•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 the flight crew.
How the Altimeter Measures Altitude
The altimeter can measure altitude based on its own preset values, or a reference altitude specified by you.
When you measure altitude based on preset values
Data produced by the watch’s barometric pressure sensor is converted to approximate altitude based on ISA (International Standard Atmosphere) conversion values stored in watch memory.
When you measure altitude using a reference altitude specified by you After you specify a reference altitude, the watch uses that value to convert the current measured barometric pressure value to altitude.
•When mountain climbing, you can set the
reference value in accordance with a marker | B |
along the way or altitude information from a |
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map. After that, the altitude readings | A |
produced by the watch will be more accurate | 400 |
than they would without a reference altitude. |
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Displaying Your Current Altitude
You can use the procedure described in this section to display your current altitude. If you leave the watch in the Altimeter Mode, it will update the displayed altitude value regularly, and indicate
Important!
•The procedure in this section simply displays values indicating your current altitude, without storing them in watch memory. For information about recording altitude readings in watch memory, see “Saving Altitude Data”.
To display your current altitude
Current altitude | 1. | Press A in the Timekeeping Mode or in any |
Altitude |
| of the other sensor modes to enter the |
| Altimeter Mode. | |
graph |
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| • The watch will start altitude measurement |
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| automatically, and display the result. |
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| • It can take up to four or five seconds for the |
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| altitude reading to appear after you enter |
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| the Altimeter Mode. |
| 2. | Leave the watch in the Altimeter Mode if you |
Current time |
| want the displayed altitude value and the |
| altitude graph contents to be updated at | |
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| regular intervals. |
•Readings are taken at
•If you want to restart the altitude measurement operation at any point, press A.
3.To stop the altitude measurement operation, press D to exit the Altimeter Mode.
Notes
•Normally, displayed altitude values are based on the watch’s preset conversion values. You also can specify a reference altitude, if you want. See “Specifying a Reference Altitude”.
•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 xxxx 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 measurement unit for displayed altitude values to either meters (m) or feet (ft). See “To select the temperature, barometric pressure, and altitude units”.
Saving Altitude Data
The watch automatically keeps track of the high altitude achieved to date. You also can save altitude readings with the touch of a button.
•You can recall and view altitude data using the Data Recall Mode. For details, see “Recalling Altitude Data”.
Automatic High Altitude Record
Whenever an altitude measurement in the Altimeter Mode is greater than the currently stored high altitude value, the watch will replace the old value with the new measurement automatically, along with the reading date and time. This feature is always enabled and cannot be turned off.
•If the current reading is the same as the existing high altitude value, the older value will be retained.
Saving an Altitude Reading
Perform the following procedure whenever you want to save an altitude reading.
To save an altitude reading
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| 1. | Press A to enter the Altimeter Mode. |
l | ll l l l ll | 2. | Hold down A until REC flashes on the display. | |
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| • At this time the watch will beep and the | |
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l | l |
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l l l ll |
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| current altitude reading value will be saved | |
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| along with the reading date (month - day) |
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| and time. |
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| 3. | REC will stop flashing and the watch will |
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| return to the Altimeter Mode automatically |
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| after data save is complete. |
• Memory can store up to 24 altitude records. Storing a new reading while there are already 24 in memory will delete the oldest record currently in memory to make room for the new reading.
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