Module No. 1675
1675-1
GENERAL GUIDE
Altimeter Mode
• Press C to change from mode to mode.
• Hold down C for one or two seconds in any mode to switch back to the
Timekeeping Mode.
AUTO
ALTI
AUTO
ALTI
2 seconds later
C
°
m
Timekeeping Mode
P
( Timekeeping Display )
( Pressure/Temperature
Display )
A
C
B
D
▲
Sensor
Press D.
Recall Mode
C
°
hPamb
AUTO
P
P
RECALL
C
°
m
A
▼
▲
Stopwatch Mode
Alarm Mode
A
Important!
BACKLIGHT
Avoid wearing the watch on the inside of your wrist. Doing so causes the Auto
Backlight to operate when it is not needed, which shortens battery life.
This watch features an electroluminescent (EL) backlight that helps you
easily read the face, even in total darkness. Its Auto Backlight function
automatically lights the watch face whenever you turn your wrist towards your
face.
Moving the watch to a position that is parallel to the ground and then tilting
it towards you more than 40 degrees causes the backlight to illuminate.
Note
• The backlight of the watch employs an electroluminescent (EL) light, which
loses illuminating power after very long use.
• Frequent use of the backlight shortens the battery life.
• The illumination provided by the backlight may be hard to see when viewed
under direct sunlight.
• The watch will emit an audible sound whenever the display is illuminated.
This is caused by a transistor that vibrates when the EL panel lights up. It
does not indicate malfunction of the watch.
More
than
40°
Parallel to
ground
• The backlight automatically turns off whenever an alarm sounds or when
you press the C or D button.
• The backlight may not illuminate if the face of the watch is more than 15
degrees off parallel as shown below. Make sure that the back of your hand
is parallel to the ground.
To manually turn on the backlight
In the Timekeeping Mode or the Altimeter
Mode, press B to illuminate the display for
about two seconds.
A
B
More than 15
Parallel to ground
More than 15
• The backlight remains lit for about two
seconds from the point you press B, even
if it is already lit when you press B. If you
keep B depressed for one or two minutes,
the backlight will automatically turn off.
degrees too low
degrees too high
P
C
D
To switch the auto backlight function on and off
In the Timekeeping Mode, hold down D for one or two seconds to turn the
auto backlight function on and off.
• Static electricity or magnetic force can interfere with proper operation of the
auto backlight function. If the auto backlight does not illuminate, try moving
the watch back to the starting position (parallel with the ground) and then tilt
it back toward you again. If this does not work, drop your arm all the way
down so it hangs at your side, and then bring it back up again.
• Under certain conditions the backlight may not light until about one second
or less after turn the face of the watch towards you. This does not necessarily
indicate malfunction of the backlight.
Auto backlight
indicator
AUTO
P
P
ON
OFF
Warning!
• The auto backlight indicator is shown on the display in all modes while the
auto backlight function is on.
• In order to protect against running down the battery, the auto backlight
function is automatically turned off approximately two or three hours after
you turn it on. Repeat the above procedure to turn the auto backlight
function back on if you want.
• Pressing B in the Timekeeping Mode or Altimeter Mode illuminates the
display for about two seconds, regardless of the auto backlight function on/
off setting.
• Never try to read your watch when mountain climbing or hiking in
areas that are dark or in areas with poor footing. Doing so is dangerous
and can result in serious personal injury.
• Never try to read your watch when running where there is the danger
of accidents, especially in locations where there might be vehicular or
pedestrian traffic. Doing so is dangerous and can result in serious
personal injury.
• Never try to read your watch when riding on a bicycle or when
operating a motorcycle or any other motor vehicle. Doing so is
dangerous and can result in a traffic accident and serious personal
injury.
About the Auto Backlight function
While the Auto Backlight function is turned on, the backlight automatically
lights for about two seconds in any mode whenever you position your wrist as
described below.
• When you are wearing the watch, make sure that its auto backlight
function is turned off before riding on a bicycle or operating a
motorcycle or any other motor vehicle. Sudden and unintended
operation of the auto backlight can create a distraction, which can
result in a traffic accident and serious personal injury.
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1675-3
To calibrate the barometric pressure
To calibrate the temperature
1. In the Timekeeping Mode, use D to display
1. In the Timekeeping Mode, use D to
display the barometric pressure and
temperature.
2. Hold down A until the display clears.
“OFF” or the temperature value should be
flashing on the display.
A
B
A
B
the barometric pressure and temperature.
2. Hold down A until the display clears.
“OFF” or the temperature value should be
flashing on the display.
C
°
hPamb
C
°
hPamb
• The “OFF” indicator appears when the
factory setting is being used for the
calibration.
C
D
C
D
3. Press C to show the barometric pressure calibration display. At this time,
“OFF” or the barometric pressure value should be flashing on the display.
• The “OFF” indicator appears when the factory setting is being used for the
calibration.
3. Each press of D increases the displayed temperature by 0.1°C while
pressing B decreases it. Holding down either button changes the value at
high speed.
4. Each press of D increases the displayed barometric pressure by 1 hPa/
mb, while pressing B decreases it. Holding down either button changes
the value at high speed.
• If you have selected inHg as your unit of measurement, the above operations
change the reading by 0.05 inHg.
• If you have selected Fahrenheit as your unit of measurement, the above
operations change the reading by 0.2°F.
• Pressing B and D at the same time returns to the “OFF” display.
4. After calibrating the temperature, press A to return to the Barometric
Pressure/Temperature Display.
• If you do not operate any button for a few minutes while the temperature
digits are flashing, the flashing stops and the watch goes back to the
Barometric Pressure/Temperature Display.
• Pressing B and D at the same time returns to the “OFF” display.
5. After calibrating the barometric pressure, press A to return to the
Barometric Pressure/Temperature Display.
• If you do not operate any button for a few minutes while the barometric
pressure digits are flashing, the flashing stops and the watch goes back to
the Barometric Pressure/Temperature Display.
ALTIMETER FUNCTIONS
A built-in altimeter uses a pressure sensor to detect the current air pressure,
which is then used to estimate the current altitude in accordance with ISA
(International Standard Atmosphere) values for altitude and air pressure. If
you preset a reference altitude, the watch will also calculate the current
relative altitude based on your preset value. Altimeter functions also include
data storage memory and an altitude alarm.
THERMOMETER FUNCTIONS
A built-in temperature sensor measures temperature and shows the measured
value on the display. The thermometer can be calibrated.
Important!
Important!
• This watch estimates altitude based on air pressure. This means that
altitude readings for the same location may vary if air pressure changes.
• Sudden changes in the weather make it impossible to produce accurate
altitude readings.
• This watch employs a semiconductor pressure sensor, which is affected by
temperature changes. When taking altitude measurements, be sure to do
so while ensuring that the watch is not exposed to temperature changes.
• Do not use this watch while participating in sports where there are sudden
altitude changes. Also, do not use this watch for applications that demand
professional or industrial level precision. This watch should not be used
while engaging in the following activities: sky diving, hang gliding,
paragliding, gyrocopter riding, glider riding, etc.
Temperature measurements are affected by your body temperature (while
you are wearing the watch), direct sunlight, and moisture. To achieve a more
accurate temperature measurement, remove the watch from your wrist, place
it in a well ventilated location out of direct sunlight, and wipe off all moisture
from the case. It takes approximately 20 to 30 minutes for the case of the
watch to reach the actual surrounding temperature.
About temperature measurements
Temperature measurements are taken automatically every five minutes,
regardless of what mode the watch is in. Measured temperature values can
be viewed in the Timekeeping or Altimeter Modes. Temperature measurements
are taken every five seconds for the first three minutes after you display the
Timekeeping Mode’s Barometric Pressure/Temperature display, or after you
enter the Altimeter Mode. After that, temperature measurements are taken
every five minutes.
Applications
When no reference altitude is preset:
• The watch produces approximate altitude readings.
• Temperature measurement data can be recalled along with altitude
measurement data. For details, see About memory data.
When a reference altitude is preset:
• Before beginning the climb, set the reference altitude to 0 m at the foot of
the mountain. This makes it possible to determine the difference in altitude
between the reference point and your destination.
Understanding the temperature display
1. Use C to enter the Timekeeping Mode.
2. Press D to display the Barometric Pressure/Temperature Display.
• To determine the height of
building, set the reference altitude to
on the ground floor. Note,
a
tall
A
B
0
m
however, that if the building is
pressurized or air conditioned, you may
not be able to get a good reading.
C
°
Temperature
hPamb
P
• To determine the difference in altitude between your house and another
location, set the reference altitude to 0 m at your house, and then check the
reading when you arrive at the other location.
C
D
( Barometric Pressure/Temperature Display )
• The display shows “– –.– °C” (or °F) if a measured value falls outside the
range of –20.0°C to 60.0°C (–4.0°F to 140.0°F). The normal display will
return as soon as the temperature returns within the allowable range.
• For details on viewing the temperature in the Altimeter Mode, see
Understanding the altimeter display.
• When mountain climbing, you can input
the altitude from a marker as your
reference altitude, which will then let
you know your altitude as your climb
proceeds. The following conditions will
400
prevent you from obtaining accurate
readings:
Calibrating the temperature measurement
When air pressure changes because of changes in the weather
Extreme temperature changes
When the watch itself is subjected to strong impact
The temperature sensor of this watch is calibrated at the factory before
shipment and further adjustment is normally not required. If noticeable error
is found in the temperature readings produced by the watch, you can adjust it
to correct the error.
About altitude measurements
Important!
There are two types of altitude measurements: those for displayed data
(Altimeter Mode measurement) and those for memory data (memory
measurements; See Memory measurements).
Incorrectly calibrating the temperature measurement of this watch can result
in incorrect readings. Carefully read the following before doing anything.
• Compare the readings produced by the watch with those of another reliable,
accurate thermometer.
• If adjustment is required, remove the watch from your wrist and wait for 20
or 30 minutes to give the temperature of the watch time to stabilize.
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1675-4
Altimeter Mode measurement
A
C
B
D
AUTO
ALTI
This type of measurement is performed only when the watch is in the
Altimeter Mode. As soon as you enter the Altimeter Mode, measurements are
taken every five seconds for the first three minutes. After that, measurements
are taken every two minutes. The display unit for Altimeter Mode measure-
ments is 5 m (20 feet), and the display range is 0 to 6000 m (0 to 19680 feet).
• The measured altitude may be a negative value in cases where there is a
reference altitude value set or because of certain atmospheric conditions.
m
( Reference
Altitude Setting )
Press C.
Press C.
Understanding the altimeter display
Use C to enter the Altimeter Mode. Note that once you enter the Altimeter
Mode, if you do not press any button for 10 or 11 hours, the watch automatically
returns to the Timekeeping Mode.
Auto memory measurement
indicator
AUTO
ALTI
AUTO
ALTI
(Altitude Graph)
(Unit: 10 m/40 ft)
m
Press C.
Current altitude
(flashing)
1
Mode indicator
( Altitude Alarm Setting )
( Memory Measurement Setting )
*
Auto memory
measurement
2
3. Press C to select the Memory Measurement Setting display (with either
“AUTO” or “MANUAL” flashing).
4. Press D to switch between auto memory measurement (“AUTO” flashing)
or manual memory measurement (“MANUAL” flashing).
5. After selecting the type of measurement you want, press A to return to
the Altimeter Mode.
indicator
*
A
B
D
AUTO
AUTO
ALTI
Target
altitude
graph
ALTI
C
°
m
P
C
Using Auto Memory Measurement
Current
temperature
Current altitude
Current time
1. Confirm that the “AUTO” indicator is shown
Remaining memory
Auto memory measurement
on the display. If it is not, use the
indicator
procedures under Selecting Auto or
1
2
“ALTI” flashes while a measurement is being taken every five seconds. It
does not flash during the measurements taken every two minutes.
“AUTO” flashes on the display while a memory measurement is in
progress. The indicator stops flashing while no measurement is being
performed.
Manual Memory Measurement to select
auto memory measurement.
2. Hold down D until the watch emits a short
beep, indicating the start of the measure-
ment.
A
B
*
*
AUTO
ALTI
C
°
m
P
• The data measured when you first start
auto memory measurement is also stored
into memory.
C
D
Memory measurements
Memory measurements are taken independently of Altimeter Mode measure-
ments and stored directly into memory (along with temperature measure-
ments) for later recall. There are two types of memory measurements: “Auto
Memory Measurements” and “Manual Memory Measurements”.
• The “AUTO” indicator flashes on the display when you start auto memory
measurements. The “AUTO” indicator continues to flash (indicating that
measurements continue) even if you change modes.
• Auto memory measurement cuts off automatically whenever there are 49
sets of data stored in memory. The 50th set of data measured when you
stop the measurement operation in step 3 below is also stored in memory.
Auto Memory Measurements
With auto memory measurement, the watch continuously performs measure-
ments whenever the minutes in the Timekeeping Mode reach 00, 15, 30, or
45, until you switch auto measurements off. The watch continues to take
measurements regardless of whether or not you change modes, so you can
keep a running log of temperature and altitude changes automatically.
3. To stop measurements at any point, hold down D again until the watch
emits a short beep.
• A final measurement is taken when you switch auto memory measurement
off, and that data is also stored into memory. Such data is indicated by “FIN”
during the recall operation.
Manual Memory Measurements
Using Manual Memory Measurement
You can use the manual procedure to take a reading anytime you want to
store your current altitude data into memory for later recall. Manual memory
measurements can be performed only while the watch is in the Altimeter
Mode.
1. Confirm that the “MANUAL” indicator is
shown on the display. If it is not, use the
procedures under Selecting Auto or
Manual Memory Measurement to select
manual memory measurement.
Manual memory
measurement indicator
A
B
MANUAL
ALTI
About the memory...
2. Hold down D until the watch emits a short
beep, indicating that a measurement is
taken.
C
°
Each memory item (auto or manual) stored by the watch consists of the
current altitude, plus the month, date, time, and temperature. Data is stored
in the same sequence that it is input.
Memory can hold a total of 50 sets of data, which is enough to store 12 hours
and 15 minutes of auto memory data (if you do not take any manual readings
during that time). See About memory data of this manual for details on how
to recall memory data.
m
P
3. Repeat step 2 whenever you want to take
a reading.
C
D
• Button operation becomes impossible during the 4 or 5 seconds that it
takes to complete a measurement. Normal operation will return once the
operation is finished.
Important!
Further auto or manual memory measurements
become impossible whenever memory is full.
Setting a Reference Altitude
AUTO
ALTI
After you set a reference altitude, the watch automatically calculates the
difference between the current altitude and your preset value. The altitude
measurements produced by this watch are subject to error caused by changes
in air pressure. Because of this, we recommend that you set the reference
altitude during your climb whenever one is available.
The message “FULL” on the display indicates
that memory is full. Always check the amount
of memory remaining before starting memory
measurements, and delete data if necessary.
Selecting Auto or Manual Memory Measurement
1. In the Altimeter Mode, hold down A until
A
B
AUTO
ALTI
the display clears. After 4 or 5 seconds,
either “OFF” or the current reference
altitude value (if set) will start to flash. The
data flashes because it is selected.
• The “OFF” indicator appears when the
factory setting is being used for the
calibration.
Use the following procedure to switch between auto or manual memory
measurement. Note that you cannot perform this operation while a preset
auto memory measurement is already in progress.
m
1. In the Altimeter Mode, hold down A until the display clears. After 4 or 5
seconds, either “OFF” or the current reference altitude value (if set) will
start to flash. The data flashes because it is selected.
C
D
2. Press C to change the selection in the following sequence.
2. Press D to increase the current reference altitude value by 5 m or B to
decrease it. Holding down either button changes the value at high speed.
• If you have selected feet as your unit of measurement, the above operations
change the reading in increments of 20 feet.
• You can set the reference altitude within the range of –6000 m to 6000 m
(–19680 feet to 19680 feet).
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1675-5
• Pressing B and D at the same time returns to the “OFF” message.
• The display below would appear at a current altitude of 160 m when you are
using auto memory measurement with a target altitude setting of 200 m and
a starting point of 100 m. Six points on the graph are darkened because you
are 6/10 of the way to your target.
3. After setting the reference altitude you want, press A to return to the
Altimeter Mode.
About the Altitude Alarm
The altitude alarm sounds for about five seconds whenever the current
altitude matches a preset value. You can press any button to stop the alarm
after it starts to sound.
About memory data
Use the following procedures to recall measurement data stored in memory.
Example
To scroll through data items
1. Use C to enter the Recall Mode.
2. Press D to scroll forward through the stored data items or B to scroll
backward.
• Holding down either button scrolls through the data items at high speed.
• The data item that is displayed when you exit the Recall Mode is still
displayed the next time you enter the Recall Mode.
If you set the altitude alarm at 130 meters, it will sound when you pass the
130-meter mark on your way up and on your way back down.
To set the altitude alarm
1. In the Altimeter Mode, hold down A until the display clears. After 4 or 5
seconds, either “OFF” or the current reference altitude value (if set) will
start to flash. The data flashes because it is selected.
Date
2. Press C to change the selection in the following sequence.
Mode indicator
Reference Altitude Setting
Altitude Alarm Setting
Memory Measurement Setting
A
C
B
D
AUTO
RECALL
C
°
m
3. Press C to select the altitude alarm setting
display (indicated by the “AL” indicator).
4. Press D to increase the altitude alarm
value by 5 m or B to decrease it. Holding
down either button changes the value at
high speed.
Altitude alarm on indicator
A
A
B
AUTO
ALTI
AL
Time
Altitude
Temperature
m
• If you have selected feet as your unit of
measurement, the above operations change
the setting in increments of 20 feet.
• You can set the altitude alarm setting within
the range of –6000 m to 6000 m (–19680
feet to 19680 feet).
• Measured data is stored in memory even if an error occurs during the
measurement. For details on errors, see ERROR WARNING FUNCTION.
C
D
About the memory data display
Data stored in memory appears in one of the formats shown below, depending
on the measurement method (auto or manual), or whether it is the maximum
or minimum reading.
• Setting an altitude value automatically switches the altitude alarm on.
5. After setting the altitude alarm value, press A to return to the Altimeter
Mode.
• Auto Memory Data
Altitude graph
Auto memory measurement indicator
*
To switch the altitude alarm off
A
B
AUTO
AUTO
1. In the Altimeter Mode, hold down A until the display clears. After 4 or 5
seconds, either “OFF” or the current reference altitude value (if set) will
start to flash. The data flashes because it is selected.
RECALL
RECALL
Press D.
Press B.
D
B
C
C
°
°
m
m
2. Press C to change the selection in the following sequence.
A
A
Reference Altitude Setting
Altitude Alarm Setting
Memory Measurement Setting
C
D
( Auto Memory Start Display )
B
3. Press C to select the altitude alarm setting display (indicated by the “AL”
indicator).
4. Press D and B at the same time to change the setting to “OFF” and
switch the altitude alarm off.
5. After switching the altitude alarm off, press A to return to the Altimeter
D
AUTO
Mode.
B
D
RECALL
C
°
m
About the Target Altitude Graph
P
The Target Altitude Graph divides the differ-
AUTO
AL
ALTI
ence between your start point altitude and
*
( End Display )
the value you set for the altitude alarm into
C
°
m
10 equal parts. It then shows a graph that
shows your current location, to give you some
idea of how much farther you must go to
reach your altitude setting.
An altitude graph appears in place of the month and date for the display of
data between the start and end data. The altitude graph divides by 8 the
difference between the maximum and minimum altitudes achieved during
the auto memory measurement, and shows relative changes.
P
*
Target altitude graph
• Manual Memory Data
Manual memory measurement indicator
The start point differs according to what type of memory measurement
*
procedure you are using. With auto memory measurements (“AUTO” shown
on the display), the start point is the first altitude measured. With manual
memory measurements (“MANUAL” shown on the display), the start point
is 0 m (0 ft).
A
B
MANUAL
MANUAL
RECALL
D
B
D
B
D
B
RECALL
C
C
°
°
m
m
• The target altitude graph is not shown on the display if the altitude alarm is
off.
A
A
C
D
Example:
• Maximum/Minimum Data
• The display below would appear at a current altitude of 160 m when you are
using manual memory measurement with a target altitude setting of 200 m.
Eight points on the graph are darkened because you are 8/10 of the way to
your target.
A
B
D
RECALL
RECALL
D
B
D
B
D
B
C
C
°
°
m
m
This indicator “
” appears
A
P
once you pass the target
altitude.
C
( Maximum Altitude )
( Minimum Altitude )
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1675-6
Deleting Data
ALARM FUNCTIONS
Delete data in the Recall Mode. The actual procedure you should use to
delete data depends on the type of data it is.
Mode indicator
When the Daily Alarm is on, the alarm sounds
Alarm on
indicator
for 20 seconds at the preset time each day.
Press any button to stop the alarm after it
starts to sound.
To delete auto memory data
The following procedure deletes an entire set (from start measurement to end
measurement) of auto memory data.
A
B
When the Hourly Time Signal is on, the watch
beeps every hour on the hour.
Important!
Auto memory
A
You cannot delete data while an auto memory
measurement indicator
measurement is in progress (“AUTO” flashing
C
D
on the display).
A
C
B
D
AUTO
Hourly time signal
on indicator
RECALL
1. In the Recall Mode, display the start data
of the set of auto memory data that you
want to delete.
2. To clear the data, hold down A until the
watch emits a beep (and until “CLR” stops
flashing on the display).
Hour
Minutes
C
°
m
A
To set the alarm time
1. Use C to enter the Alarm Mode.
2. Hold down A until the hour digits flash on the display. The hour digits
flash because they are selected.
(
Auto Memory Start Display
)
• At this time, the alarm is automatically switched on.
3. Press C to change the selection in the following sequence.
To delete manual memory, maximum, and minimum data
1. In the Recall Mode, display the data that you want to delete.
2. To clear the data, hold down A until the watch emits a beep (and until
“CLR” stops flashing on the display).
Hour
Minutes
4. Press D to increase the selected digits. Holding down D changes the
selection at high speed.
• The format (12-hour and 24-hour) of the alarm time matches the format you
select for normal timekeeping.
• When setting the alarm time using the 12-hour format, take care to set the
time correctly as morning (A) or afternoon (P).
ERROR WARNING FUNCTION
This watch is designed to automatically stop taking measurements when
there is a sensor malfunction, when battery power drops below a certain
level, or when battery voltage is decreased below a certain level due to very
cold temperatures.
5. After you set the alarm, press A to return to the Alarm Mode.
To switch the Daily Alarm and Hourly Time Signal on and off
Press D while in the Alarm Mode to change the status of the Daily Alarm and
Hourly Time Signal in the following sequence.
Sensor malfunction
During Altitude Measurement
During Barometric Pressure
Measurement
[Alarm ON Indicator / Hourly Time Signal ON Indicator]
AUTO
ALTI
Hourly Time
Signal only
Daily Alarm only
Both OFF
C
C
Both ON
°
°
m
hPamb
P
P
ERROR
ERROR
To test the alarm
Hold down D while in the Alarm Mode to sound the alarm.
ERROR
STOPWATCH FUNCTIONS
Low battery
During Barometric Pressure
Measurement
Mode indicator
The Stopwatch Functions let you record
elapsed time, split times, and two finishes.
The range of the stopwatch is 23 hours, 59
minutes, 59.99 seconds.
During Altitude Measurement
A
B
AUTO
ALTI
Stopwatch functions are available in the Stop-
watch Mode, which you can enter using C.
C
C
°
°
m
hPamb
P
P
C
D
BATTERY
BATTERY
1/100 second
Seconds
Hours
Minutes
(a) Elapsed time measurement
BATTERY
D
Start
D
Stop
D
Re-start
D
Stop
B
Clear
(b) Split time measurement
Important!
B
D
B
D
B
Start
Split
Split release
Stop
Clear
• If the sensor is malfunctioning when it comes time for an barometric
pressure measurement to be taken, the barometric pressure value appears
as “– – – –” on the display and the corresponding point on the barometric
pressure graph is left blank.
• There may be cases where the “ERROR” or “BATTERY” message is
cleared once you change modes. In this case, you can continue using the
watch normally unless the error warning message reappears.
(c) Split time and 1st-2nd place times
D
Start
B
Split
First runner
finishes.
D
Stop
Second runner finishes.
Record time of first runner.
B
B
Split release Clear
Record time of
second runner.
Whenever there is a sensor malfunction, be sure to take the watch to an
authorized CASIO distributor or Service Center as soon as possible. If the
appearance of the “BATTERY” message is caused by extremely low
temperature, the message should clear from the display when normal
temperature returns. It is recommended, however, that you still have the
watch checked by an authorized CASIO distributor or Service Center.
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1675-7
ABOUT ALTITUDE AND AIR PRESSURE
MEASUREMENTS
Altimeter
Generally, air pressure and temperature decrease as altitude increases. This
watch bases its altitude measurements on International Standard Atmos-
phere (ISA) values stipulated by the International Civil Aviation Organization
(ICAO), which define relationships between altitude, air pressure, and tem-
perature.
ALTITUDE
AIR PRESSURE
472 hPa/mb
TEMPERATURE
–24°C
6000 m
About 6.7 hPa/mb per 100 m
5500 m
–17.5°C
–11°C
–4.5°C
2°C
540 hPa/mb
616 hPa/mb
701 hPa/mb
795 hPa/mb
899 hPa/mb
1013 hPa/mb
5000 m
4000 m
3000 m
2000 m
About 7 hPa/mb per 100 m
About 8 hPa/mb per 100 m
4500 m
3500 m
2500 m
1500 m
500 m
About 6.5°C
About 9 hPa/mb per 100 m
per 1000 m
About 10 hPa/mb per 100 m
About 11 hPa/mb per 100 m
8.5°C
15°C
1000 m
0 m
About 12 hPa/mb per 100 m
Source: International Civil Aviation Organization
ALTITUDE
AIR PRESSURE
TEMPERATURE
13.76 inHg
–12.2°F
2.0°F
20000 ft
About 0.119 inHg per 200 ft
About 0.1315 inHg per 200 ft
18000 ft
16000 ft
14000 ft
12000 ft
10000 ft
16.22 inHg
19.03 inHg
22.23 inHg
25.84 inHg
29.92 inHg
16.2°F
About 0.15 inHg per 200 ft
About 3.6°F
per 1000 ft
30.5°F
44.7°F
59.0°F
8000 ft
About 0.17 inHg per 200 ft
About 0.192 inHg per 200 ft
6000 ft
2000 ft
4000 ft
0 ft
About 0.21 inHg per 200 ft
Source: International Civil Aviation Organization
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.
Rooftop at an altitude of
Height of building 130 m
230 m above sea level
(Relative altitude)
(Altitude above sea level)
Sea
Barometer
Barometric pressure indicates changes in the atmosphere, and by monitoring
these changes you can predict the weather with reasonable accuracy. Rising
barometric pressure indicates good weather, while falling pressure indicates
deteriorating 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.
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