Casio Protrek PRG-130GC-3 Operation Manual page 5

Operation Guide 3135 3206
Note that if there are sudden changes in barometric
pressure or temperature, the graph line of past
measurements may run off the top or bottom of the display.
The entire graph will become visible once barometric
conditions stabilize.
The following conditions cause the barometric pressure
measurement to be skipped, with the corresponding point on
the barometric pressure graph being left blank.
• Barometric reading that is out of range (260 hPa/mb to 1,100 hPa/mb or
7.65 inHg to 32.45 inHg)
• Sensor malfunction
Barometric Pressure Differential Pointer
This pointer indicates the relative difference between the most recent
barometric pressure reading indicated on the barometric pressure graph, and
the current barometric pressure value displayed in the Barometer/
Thermometer Mode.
• Pressure differential is indicated in the range of ±5 hPa, in 1-hPa units.
• The barometric pressure differential pointer is not displayed when the
displayed current barometric value is outside of the allowable measurement
range (260 to 1,100 hPa).
• Barometric pressure is calculated and displayed using hPa as the standard.
The barometric pressure differential also can be read in inHg units as
shown in the illustration.
inHg values
hPa values
Barometric pressure
differential
Pressure differential
examples in the
illustration are indicated
in 3 hPa/0.1 inHg steps.
About Barometric and Temperature Measurements
• Barometric pressure and temperature measurement operations are
performed as soon as you enter the Barometer/Thermometer Mode. After
that, barometric pressure and temperature measurements are taken every
five seconds.
• You also can perform a barometric pressure and temperature measurement
at any time by pressing B in the Barometer/Thermometer Mode.
Altimeter
The watch's altimeter uses a pressure sensor to detect current air pressure,
which is then used to estimate the current altitude based on ISA (International
Standard Atmosphere) preset values. You also can specify a reference
altitude, which the watch will use to calculate your current altitude based on
the value you specify. Altimeter functions also include storage of
measurement data in memory.
Important!
• This watch estimates altitude based on air pressure. This means that
altitude readings for the same location may vary if air pressure changes.
• The semiconductor pressure sensor used by the watch for altitude
measurements also is affected by temperature. When taking altitude
measurements, make sure the watch is not subjected to temperature
changes.
• To avoid the effect of sudden temperature changes during measurement,
keep the watch on your wrist in direct contact with your skin.
• Do not rely upon this watch for altitude measurements or perform button
operations while sky diving, hang gliding, or paragliding, while riding a
gyrocopter, glider, or any other aircraft, or while engaging in any other
activity where there is the chance of sudden altitude changes.
• Do not use this watch for measuring altitude in applications that demand
professional or industrial level precision.
• Remember that the air inside of a commercial aircraft is pressurized.
Because of this, the readings produced by this watch will not match the
altitude readings announced or indicated the flight crew.
How the Altimeter Measures Altitude
The altimeter can measure altitude based on its own preset values, or a
reference altitude specified by you.
When you measure altitude based on preset values
Data produced by the watch's barometric pressure sensor is converted to
approximate altitude based on ISA (International Standard Atmosphere)
conversion values stored in watch memory.
When you measure altitude using a reference altitude specified by you
After you specify a reference altitude, the watch uses that value to convert the
current measured barometric pressure value to altitude.
• When mountain climbing, you can set the
Not visible on
the display.
Displaying Your Current Altitude
You can use the procedure described in this section to display your current
altitude. If you leave the watch in the Altimeter Mode, it will update the
displayed altitude value regularly, and indicate reading-to-reading changes in
the altitude graph at the top of the display.
Important!
• The procedure in this section simply displays values indicating your current
To display your current altitude
Altitude
graph
Current pressure greater
than most recent
measured pressure
Current pressure less
than most recent
measured pressure
3. To stop the altitude measurement operation, press D to exit the Altimeter
Notes
• Normally, displayed altitude values are based on the watch's preset
• Altitude is displayed in units of 5 meters (20 feet).
• The measurement range for altitude is –700 to 10,000 meters (–2,300 to
• The measured altitude may be a negative value in cases where there is a
• The displayed altitude value changes to
• You can change the measurement unit for displayed altitude values to either
Saving Altitude Data
The watch automatically keeps track of the high altitude achieved to date.
You also can save altitude readings with the touch of a button.
• You can recall and view altitude data using the Data Recall Mode. For
Automatic High Altitude Record
Whenever an altitude measurement in the Altimeter Mode is greater than the
currently stored high altitude value, the watch will replace the old value with
the new measurement automatically, along with the reading date and time.
This feature is always enabled and cannot be turned off.
• If the current reading is the same as the existing high altitude value, the
Saving an Altitude Reading
Perform the following procedure whenever you want to save an altitude reading.
To save an altitude reading
• Memory can store up to 24 altitude records. Storing a new reading while
reference value in accordance with a marker
along the way or altitude information from a
map. After that, the altitude readings
produced by the watch will be more accurate
than they would without a reference altitude.
altitude, without storing them in watch memory. For information about
recording altitude readings in watch memory, see "Saving Altitude Data".
1. Press A in the Timekeeping Mode or in any
Current altitude
of the other sensor modes to enter the
Altimeter Mode.
• The watch will start altitude measurement
automatically, and display the result.
• It can take up to four or five seconds for the
altitude reading to appear after you enter
the Altimeter Mode.
2. Leave the watch in the Altimeter Mode if you
want the displayed altitude value and the
Current time
altitude graph contents to be updated at
regular intervals.
• Readings are taken at five-second intervals for the first three minutes
after you enter the Altimeter Mode. After that, readings are taken at two-
minute intervals.
• If you want to restart the altitude measurement operation at any point,
press A.
Mode.
conversion values. You also can specify a reference altitude, if you want.
See "Specifying a Reference Altitude".
32,800 feet).
reference altitude value set or because of certain atmospheric conditions.
measured altitude falls outside the measurement range. The altitude value
will be displayed again as soon as the measured altitude is within the
allowable range.
meters (m) or feet (ft). See "To select the temperature, barometric pressure,
and altitude units".
details, see "Recalling Altitude Data".
older value will be retained.
1. Press A to enter the Altimeter Mode.
2. Hold down A until REC flashes on the display.
• At this time the watch will beep and the
current altitude reading value will be saved
along with the reading date (month - day)
and time.
3. REC will stop flashing and the watch will
return to the Altimeter Mode automatically
after data save is complete.
there are already 24 in memory will delete the oldest record currently in
memory to make room for the new reading.
B
A
400
xxxx meters (or feet) if a
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