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2413-4
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.
0 m
500 m
1000 m
1500 m
2000 m
2500 m
3000 m
3500 m
4000 m
899 hPa/mb
795 hPa/mb
701 hPa/mb
616 hPa/mb
8.5°C
2°C
–4.5°C
–11°C
15°C1013 hPa/mb
About 6.5°C
per 1000 m
About 8 hPa/mb per 100 m
About 9 hPa/mb per 100 m
About 10 hPa/mb per 100 m
About 11 hPa/mb per 100 m
About 12 hPa/mb per 100 m
Altitude Air Pressure Temperature
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.
Height of building 130 m
(relative altitude)
Rooftop at an altitude of
230 m above sea level
(altitude above sea level)
Sea
Altitude Air Pressure
0 ft
2000 ft
4000 ft
6000 ft
8000 ft
10000 ft
12000 ft
14000 ft
25.84 inHg
22.23 inHg
19.03 inHg
44.7°F
30.5°F
16.2°F
59.0°F29.92 inHg
About 3.6°F
per 1000 ft
About 0.15 inHg per 200 ft
About 0.17 inHg per 200 ft
About 0.192 inHg per 200 ft
About 0.21 inHg per 200 ft
Source: International Civil Aviation Organization
Temperature
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/cm
2
) 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 D at
the same time to reset the depth reading to zero.
Backlight Precautions
The backlight uses an EL (electro-luminescent) panel that causes the entire display to
glow for easy reading in the dark. In any mode (except for the Stopwatch Mode),
press B to illuminate the display for about one second.
• The backlight does not turn on if you press B while a setting screen is on the
display.
• The electro-luminescent panel that provides illumination loses power after very long
use.
• 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 A until the barometric pressure value starts
to flash. This indicates the barometric value setting
screen.
3.Use D (+) and B (–) to change the value in 1hPa/mb
(0.05inHg) increments.
• 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 A to 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 C to enter the Altimeter Mode.
2.After the result of the current measurement appears,
hold down A until the altitude value starts to flash. This
indicates the reference altitude value setting screen.
3. Press C to toggle the measurement unit between
meters (M) and feet (F).
4.Press A to 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.
• When you press A to 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 C to enter the Barometer Mode.
2.After the result of the current measurement appears,
hold down A until the barometric pressure value starts
to flash. This indicates the barometric value setting
screen.
3.Press C to toggle the measurement unit between
hPa/mb and inHg.
4.Press A to exit the setting screen.
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 C to enter the Depth Gauge Mode.
2.Hold down A until the current measurement unit starts
to flash. This indicates the measurement unit setting
screen.
3. Press C to toggle the measurement unit between
meters (M) and feet (F).
4.Press A to exit the setting screen.