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1998/2198-8
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 Digital Compass operation 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 the Digital Compass to produce
different readings at the same location?
Answer:
• Direction being measured is somewhere between two measurable
directions (N and NNW, for example). The Digital Compass is designed to
indicate any one of 16 different directions. If you move the 12 o’clock
position slightly to the left or right (to move it off of the point between the
two measurable directions), the Digital Compass should consistently
produce the same reading.
• Magnetism generated by nearby high-tension wires are interfering with
reception of terrestrial magnetism. Move away from the high-tension
wires and try again.
Question: What does it mean when “– – –” 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 performing Digital
Compass operations indoors?
Answer: TV, personal computer, speakers, or some other object is interfering
with terrestrial magnetism. Move away from the object causing the
interference or perform the Digital Compass operation outdoors. Indoor
Digital Compass operations are particularly difficult inside ferroconcrete
structures. Remember that you cannot perform Digital Compass operations
inside of trains, airplanes, etc.
540hPa/mb
616hPa/mb
701hPa/mb
795hPa/mb
899hPa/mb
1013hPa/mb
472hPa/mb
0 m
500 m
1,000 m
1,500 m
2,000 m
2,500 m
3,000 m
3,500 m
4,000 m
4,500 m
5,000 m
5,500 m
6,000 m
8.5°C
2°C
–4.5°C
–11°C
–17.5°C
–24°C
15°C
About 6.5°C
per 1,000 m
About 6.7hPa/mb per 100 m
About 7hPa/mb per 100 m
About 8hPa/mb per 100 m
About 9hPa/mb per 100 m
About 10hPa/mb per 100 m
About 11hPa/mb per 100 m
About 12hPa/mb per 100 m
ALTITUDE AIR PRESSURE TEMPERATURE
Source: International Civil Aviation Organization
0 ft
2,000 ft
4,000 ft
6,000 ft
8,000 ft
10,000 ft
12,000 ft
14,000 ft
16,000 ft
18,000 ft
20,000 ft
25.84inHg
22.23inHg
19.03inHg
16.22inHg
13.76inHg
44.7°F
30.5°F
16.2°F
2.0°F
–12.2°F
59.0°F29.92inHg
About 3.6°F
per 1,000 ft
About 0.119inHg per 200 ft
About 0.1315inHg per 200 ft
About 0.15inHg per 200 ft
About 0.17inHg per 200 ft
About 0.192inHg per 200 ft
About 0.21inHg per 200 ft
ALTITUDE AIR PRESSURE TEMPERATURE
Source: International Civil Aviation Organization
Question: How does the altimeter work?
Answer: Generally, air pressure and temperature decrease as altitude
increases. This watch is equipped with a pressure sensor and bases its
altitude measurements on International Standard Atmosphere (ISA) values
stipulated by the International Civil Aviation Organization (ICAO), which
define relationships between altitude, air pressure, and temperature.
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.
Example: To obtain readings that are close to absolute altitude.
When you are out hiking or mountain climbing, calibrate the altimeter using
an altitude value from another source (a signpost or map, for example). Do
this just before you start your altitude measurements.
1. At Point A, calibrate the altimeter to 400
meters.
2. Proceed from Point A to Point B, taking
altimeter measurements along the way.
• If you also have altitude data for Point B,
you should again calibrate the altimeter
there.
• Be sure to recalibrate at Point B if changing weather conditions produce
altitude reading errors.
• The following conditions will prevent you from obtaining accurate readings:
Air pressure changes because of changes in the weather
Extreme temperature changes
Subjecting the watch to strong impact
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.
400
Rooftop at an altitude of 230m
above sea level
(Altitude above sea level)
Height of building
130m
(Relative altitude)
Sea
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 pressure 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 the C button for two or three seconds to return to the
Timekeeping Mode. Next, try performing the operation you want again.
• The measurement functions built into this watch are not intended for
use in taking measurements that require professional or industrial
precision. Values produced by this watch should be considered as
reasonably accurate representations only.
• When engaging in mountain climbing or other activities in which losing
your way can create a dangerous or life-threatening situation, always
be sure to use a second compass to confirm direction readings.
• CASIO COMPUTER CO., LTD. assumes no responsibility for any loss,
or any claims by third parties that may arise through the use of this watch.
A
B