Casio 2147 Genel Kılavuz - Sayfa 4

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Casio 2147 Genel Kılavuz

THINGS TO KNOW ABOUT ALTITUDES

Relationships between altitude, barometric pressure, and temperature
Generally, barometric 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), which de-
fine relationships between altitude, barometric pressure, and temperature.
ALTITUDE
BAROMETRIC PRESSURE
616 hPa(mb)
About 8 hPa(mb) per 100m
4,000 m
3,500 m
701 hPa(mb)
About 9 hPa(mb) per 100m
3,000 m
2,500 m
795 hPa(mb)
About 10 hPa(mb) per 100m
2,000 m
1,500 m
899 hPa(mb)
About 11 hPa(mb) per 100m
1,000 m
500 m
About 12 hPa(mb) per 100m
1,013 hPa(mb)
0 m
Source: International Civil Aviation Organization

How altitude is 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)
Example: To obtain readings that are close to absolute altitude.
When you are out hiking or mountain climbing, calibrate the altimeter using an alti-
tude 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 altime-
ter 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 reading errors.
• The following conditions will prevent you from obtaining accurate readings.
When barometric pressure changes because of change in the weather
Extreme temperature changes
When the watch itself is subjected to strong impact
TEMPERATURE
–11 °C
–4.5 °C
About
6.5 °C
2 °C
per
8.5 °C
1,000 m
15 °C
Rooftop at an altitude of
230 m above sea level
(Altitude above sea level)
Sea
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