Altimeter Mode
How does the altimeter work?
Generally, air pressure and temperature decrease as altitude increases. Under its factory defaut setting, this watch bases its altitude measurements on International Standard Atmosphere (ISA) values stipulated by the International Civil Aviation Organization (ICAO). These values define relationships between altitude, air pressure, and temperature.
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| 4000 m |
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| 616 hPa/mb | About 8 hPa/mb per 100 m |
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| 3500 m |
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| 701 hPa/mb |
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| 3000 m |
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| About 9 hPa/mb per 100 m |
| About 6.5° C |
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| 2500 m |
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| 795 hPa/mb |
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| 2° C |
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| 2000 m |
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| About 10 hPa/mb per 100 m |
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| 1500 m |
| 899 hPa/mb | About 11 hPa/mb per 100 m |
| 8.5° C |
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| 1000 m |
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| 500 m |
| 1013 hPa/mb | About 12 hPa/mb per 100 m |
| 15° C |
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| 0 m |
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| Source: International Civil Aviation Organization |
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| Altitude |
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| Air Pressure |
| Temperature |
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| 14000 ft |
| 19.03 inHg |
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| 16.2° F |
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| 12000 ft |
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| About 0.15 inHg per 200 ft |
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| 10000 ft |
| 22.23 inHg | About 0.17 inHg per 200 ft |
| 30.5° F |
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| 8000 ft |
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| About 3.6° F |
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| 6000 ft |
| 25.84 inHg | About 0.192 inHg per 200 ft | 44.7° F | per 1000 ft |
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| 4000 ft |
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| 2000 ft |
| 29.92 inHg | About 0.21 inHg per 200 ft | 59.0° F |
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| 0 ft |
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Source: International Civil Aviation Organization
How is altitude expressed?
There are two standard methods of expressing altitude: absolute altitude and relative altitude. Absolute altitude expresses an absolute height above sea level. Relative altitude expresses the difference between the height of two different places.
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| Height of building 130 m |
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| (relative altitude) |
| 230 m above sea level | |||||||||
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Depth Gauge Mode
About depth and water pressure
Water pressure increases with depth. In the case of sea water (specific gravity=1.025), water pressure increases by 1 ATM (1.03 kg/cm2) with each 10 meters (33 feet) of depth.
This watch makes use of the relationship between pressure and depth, using a pressure sensor to calculate the water pressure and then converting this data into depth readings.
Depth Gauge Measurement Precautions
You cannot exit the Depth Gauge Mode or change the measurement unit setting while the depth reading on the display is any value other than zero. This is to prevent accidental switching from the Depth Gauge Mode while underwater.
Automatic Zero Depth Reset
The initial displayed depth reading is zero whenever you enter the Depth Gauge Mode, even if you are underwater. Because of this, you should enter the Depth Gauge Mode just before starting your dive. Do not enter the Depth Gauge Mode while underwater.
Manual Zero Depth Reset
In some cases, such as when the sensor is exposed to wide changes in temperature, the display may show a depth of greater than 1.0 meter (3 feet) even when you are on the surface. In this case, hold down C and Dat the same time to reset the depth reading to zero.
Backlight Precautions
The backlight uses an EL
•The backlight does not turn on if you press Bwhile a setting screen is on the display.
•The
•The watch may emit an audible sound whenever the display is illuminated. This is due to vibration of the EL panel used for illumination, and does not indicate malfunction.
•The illumination provided by the backlight may be hard to see when viewed under direct sunlight.
•The backlight turns off whenever an alarm sounds.
•The backlight remains lit for about one second from the point you press the button, even if it is already lit when you press the button. If you keep the button depressed for one second or more, the backlight turns off.
•Frequent use of the backlight shortens battery life.
Calibrating a Barometric Pressure Value and Specifying a Measurement Unit
The pressure sensor of this watch is calibrated at the factory before shipment and further adjustment is normally not required. If you notice serious errors in the barometric pressure readings produced by the watch, you can calibrate the sensor to correct the errors.
Important!
Incorrectly calibrating the barometric pressure sensor can result in incorrect readings. Before performing the calibration procedure, compare the readings produced by the watch with those of another reliable and accurate barometer.
To calibrate the barometric pressure value
1.Press C to enter the Barometer Mode.
2.After the result of the current measurement appears, hold down Auntil the barometric pressure value starts
to flash. This indicates the barometric value setting screen.
3. Use D (+) and B
•You can calibrate the barometric pressure value in the range of 600 to 1100hPa/mb (17.70 inHg to 32.45inHg).
•Pressing B and D at the same time displays
“xxxx”, which indicates factory preset calibration.
4.Press Ato exit the setting screen.
•When you press Ato exit the setting screen after changing the barometric pressure setting, numbers cycle on the display at high speed for about nine seconds. This does not indicate malfunction. It indicates that the watch is performing internal calibration.
To specify the barometric pressure unit
1.Press Cto enter the Barometer Mode.
2.After the result of the current measurement appears, hold down Auntil the barometric pressure value starts
to flash. This indicates the barometric value setting screen.
3. Press Cto toggle the measurement unit between hPa/mb and inHg.
4. Press Ato exit the setting screen.
Specifying the Measurement Unit
To specify the altitude unit
Important!
You cannot set the reference altitude value and specify the altitude measurement unit during the same procedure. You must complete one operation (reference altitude value setting, for example), exit the setting screen, and then start the other operation (altitude measurement unit specification, in this example).
1.Press Cto enter the Altimeter Mode.
2.After the result of the current measurement appears,
hold down Auntil the altitude value starts to flash. This indicates the reference altitude value setting screen.
3. Press Cto toggle the measurement unit between meters (M) and feet (F).
4.Press Ato exit the setting screen.
•If you change the altitude measurement unit (M or F) after setting a reference altitude, the Altimeter Mode performs altitude measurements based on factory default settings.
To specify the depth measurement unit
Important!
You cannot change the depth measurement unit when the depth reading is any value other than zero.
1.Press Cto enter the Depth Gauge Mode.
2.Hold down Auntil the current measurement unit starts to flash. This indicates the measurement unit setting screen.
3.Press Cto toggle the measurement unit between
meters (M) and feet (F).
4. Press Ato exit the setting screen.