Altitude Reading Precautions; Barometric Pressure Measurement; Checking The Current Barometric Pressure - Casio 5660 Operation Manual

Altitude Reading Precautions

Effects of Temperature
When taking altitude readings, take the steps
below to keep the watch at as stable a
temperature as possible. Changes in
temperature can affect altitude readings.
Take readings with the watch on your wrist.
●
Take readings in an area where temperature
●
is stable.
Altitude Readings
Do not use this watch while skydiving, hang
●
gliding, paragliding, gyrocopter flying, glider
flying, or engaged in other activities where
altitude changes suddenly.
Altitude readings produced by this watch are
●
not intended for special-purpose or industrial
level use.
In an aircraft, the watch measures the in-cabin
●
pressurized air pressure, so readings will not
match altitudes announced by the crew.
Altitude Readings (Relative Altitude)
This watch uses International Standard
Atmosphere (ISA) relative altitude data defined
by the International Civil Aviation Organization
(ICAO). Barometric pressure generally becomes
lower as altitude increases.
Correct measurement may not be possible
under the conditions below.
During unstable atmospheric conditions
●
During sudden temperature changes
●
After the watch has been subjected to strong
●
impact
Watch Operation Guide 5660
Barometric Pressure
You can use the Barometer Mode to take a
reading of the barometric pressure at your
current location, and to track reading changes
and trends.
Important!
Check the information at the link below
●
to find out how to ensure correct
readings.
Calibrating Barometric Pressure
l
Readings (Offset)
Barometric Pressure Reading
l
Precautions
Measurement
Checking the Current
Barometric Pressure
1.
Enter the Barometer Mode.
Navigating Between Modes
l
Entering the Barometer Mode starts
measurement, and displays the
barometric pressure at your current
location and a barometric pressure graph.
After you enter the Barometer Mode,
●
the watch takes readings about every
five seconds for three minutes. After
that, a measurement is taken about
every two minutes.
Barometric pressure graph
Barometric pressure
To retrigger measurement, press (A).
●
To return to the Timekeeping Mode,
●
hold down (B) for at least two seconds.
Note
When you enter the Barometer Mode,
●
the second hand indicates either
timekeeping seconds, or the
differential between barometer
measurements (whichever was
indicated the last time you were in the
Barometer Mode).
You can toggle between the two
second hand functions by pressing
(D).
The watch will automatically return to
●
the Timekeeping Mode from the
Barometer mode if you do not perform
any operation for about one hour.
The measurement range is 260 hPa to
●
1,100 hPa (7.65 inHg to 32.45 inHg) (1
hPa (0.05 inHg) units). [- - -] will appear
for the measured value if it is outside
the allowable range.
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