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2271-6
To turn the auto light switch on and off
In the Timekeeping, Digital Compass, Barometer/Thermometer, or Altimeter
Mode, hold down C for about one second to toggle the auto light switch on
(
displayed) or off ( not displayed).
• Pressing C while in the Timekeeping, Digital Compass, or Altimeter Mode
initially switches to the Barometer/Thermometer Mode. Keeping C
depressed toggles the auto light switch on or off.
• The auto light switch on indicator (
) is on the display in all modes
while the auto light switch is turned on.
• In order to protect against running down the batteries, the auto light switch
automatically turns off approximately six hours after you turn it on. Repeat
the above procedure to turn the auto light switch back on if you want.
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
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
QUESTIONS & ANSWERS
Question: What causes incorrect direction readings?
Answer:
• Incorrect bidirectional calibration. Perform bidirectional calibration.
Remember that bidirectional calibration is required whenever batteries are
replaced.
• Nearby source of strong magnetism, such as a household appliance, a
large steel bridge, a steel beam, overhead wires, etc., or an attempt to
perform direction measurement on a train, boat, etc. Move away from large
metal objects and try again. Note that digital compass operation cannot be
performed inside a train, boat, etc.
Question: What causes different direction readings to produce different
results at the same location ?
Answer: Magnetism generated by nearby high-tension wires are interfering
with detection of terrestrial magnetism. Move away from the high-
tension wires and try again.
Question: What does it mean when
xxxxxx
xxxxxx
xxx appears in place of a direction ?
Answer: This is the abnormal magnetic field indicator. It means that strong
magnetism is being generated nearby. Move away from the
source of strong magnetism and try again.
Question: Why am I having problems taking direction readings indoors ?
Answer: A TV, personal computer, speakers, or some other object is
interfering with terrestrial magnetism readings. Move away from
the object causing the interference or take the direction reading
outdoors. Indoor taking direction readings are particularly difficult
inside ferro-concrete structures. Remember that you will not be
able to take direction readings inside of trains, airplanes, etc.
Question: What do the numbers on the watch mean?
Answer: The face of this watch is marked with values
that increase in a counterclockwise direction.
These values represent degrees. When you
take a direction reading, you can use these
values to find out how many degrees the 12
o’clock position of this watch (which is the
direction indicated in the digital display) differs
from magnetic north.
For example, when the Magnetic North Pointer is pointing at “90” on the
watch’s face, it means that the 12 o’clock position is 90 degrees from
magnetic north (which means that the 12 o’clock pointing due east).
Question: How does the altimeter work?
Answer: Generally, air pressure and temperature decrease as altitude
increases. 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.
90
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.
Precautions Concerning Simultaneous Measurement of Altitude and
Temperature
Though you can perform altitude and temperature measurements at the same
time, you should remember that each of these measurements require
different conditions for best results. With temperature measurement, it is best
to remove the watch from your wrist in order to eliminate the effects of body
heat. In the case of altitude measurement, on the other hand, it is better to
leave the watch on your wrist, because doing so keeps the watch at a
constant temperature, which contributes to more accurate altitude
measurements.
The following describes what you should do to give priority to either altitude or
temperature.
• To give altitude measurement priority, leave the watch on your wrist or in
any other location where the temperature of the watch is kept constant.
• To give temperature measurement priority, remove the watch from your
wrist and allow it to hand freely from your bag or in another location where
it is not exposed to direct sunlight. Note that removing the watch from your
wrist can momentarily affect pressure sensor readings.
Question: How does the barometer work?
Answer: Barometric pressure indicates changes in the atmosphere, and by
monitoring these changes you can predict the weather with
reasonable accuracy. Rising atmospheric pressure indicates good
weather, while falling pressure indicates deterioration weather
conditions.
The barometric pressures that you see in the newspaper and on
the TV weather report are measurements corrected to values
measured at 0 m sea level.
Question: What should I do if I lose track of which mode I am in or lose
my way when making settings?
Answer: Hold down D for about one second to return to the Timekeeping
Mode. Next, try performing the operation you want again.
Height of building 130 m
(Relative altitude)
Rooftop at an altitude of
230 m above sea level
(Altitude above sea level)
Sea
REFERENCE
This section contains more detailed and technical information about watch
operation. It also contains important precautions and notes about the various
features and functions of this watch.
Auto Display Function
Auto Display function of this watch continually
changes the contents of the digital display.
Note that you cannot use any of the watch’s
other functions while the Auto Display function
is operating.
To turn the Auto Display off
Hold down D for about three seconds until
the watch beeps.
To turn the Auto Display on
In the Timekeeping Mode, hold down D for about three seconds until the
watch beeps three times.
• Note that the Auto Display function cannot be performed while you are
making settings.
Warning Indicators
Warning indicators appear whenever any of the conditions described below
occur. Appearance of a warning indicator causes any measurement operation
that is currently underway to stop. Warning indicators appear in the upper
display area, and this causes
xxx to replace any directional, temperature,
barometer, or altitude values on the display.
Abnormal Magnetic Field Indicator
This indicator appears whenever the watch
has a problem obtaining a correct direction
reading. This condition could indicate that the
watch is within a very high magnetic field, and
so you should try moving to another location.
Also, see “Digital Compass Precautions” for
further information on conditions that cause
errors.