Taking Barometric Pressure And Temperature Readings - Casio 3410 Operation Manual

Example: Positioning a map in accordance with actual surroundings (setting a map)
You can align a map with the northerly direction indicated by the watch, and then compare what is shown
on the map with your actual surroundings. This is helpful for checking your current location and the
location of your objective. This process is called "setting a map".
Saving a Bearing (Bearing Memory)
You can save the bearing to a particular destination in bearing memory and use it to ensure you are
headed in the correct direction.
1. While the direction and bearing to your objective (page E-54) are displayed, press A.
• This saves the objective information in bearing memory, and displays it as shown below. Now,
any time you are in the Digital Compass Mode, you can check the objective information currently
stored in bearing memory.
Bearing to Objective
North
2. To return to direction (north, south, east, west) indication, press A to delete bearing memory contents.
Example: Advancing to an objective while monitoring your bearing
Even if you lose sight of your objective, you can use a map to store the required bearing in bearing
memory and refer to the memorized information to advance to your objective.
E-56
Magnetic Declination Correction
With magnetic declination correction, you input a magnetic declination angle (difference between
magnetic north and true north), which allows the watch to indicate true north. You can perform this
procedure when the magnetic declination angle is indicated on the map you are using. Note that you can
input the declination angle in whole degree units only, so you may need to round off the value specifi ed
on the map. If your map indicates the declination angle as 7.4°, you should input 7°. In the case of 7.6°
input 8°, for 7.5° you can input 7° or 8°.
To perform magnetic declination correction
1. In the Digital Compass Mode, hold down the watch's E button for at
Magnetic declination angle Magnetic declination angle
least two seconds. Release E after -1- appears.
direction value (E, W, or OFF) direction value (E, W, or OFF)
2. Press D.
• DEC will appear on the display and then the current magnetic
declination angle setting will fl ash on the display.
3. Use A (East) and C (West) to change the settings.
• The following explains magnetic declination angle direction
settings.
OFF: No magnetic declination correction performed. The magnetic
declination angle with this setting is 0°.
E: When magnetic north is to the east (east declination)
W: When magnetic north is to the west (west declination)
• You can select a value within the range of W 90° to E 90° with
Magnetic declination Magnetic declination
angle value angle value these settings.
• You can turn off (OFF) magnetic declination correction by pressing
A and C at the same time.
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Storage
• The precision of the bearing sensor may deteriorate if the watch becomes magnetized. Because of
this, you should store the watch away from magnets or any other sources of strong magnetism,
including: permanent magnets (magnetic necklaces, etc.) and household appliances (TVs, personal
computers, washing machines, freezers, etc.).
• Whenever you suspect that the watch may have become magnetized, perform the procedure under "To
perform 2-point calibration" (page E-52).
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Barometric Pressure
Barometric pressure Barometric pressure
• Barometric pressure is displayed in units of 1 hPa (or 0.05 inHg).
change indicator change indicator
• The displayed barometric pressure value changes to - - - if a measured
barometric pressure falls outside the range of 260 hPa to 1,100 hPa (7.65
inHg to 32.45 inHg). The barometric pressure value will reappear as
soon as the measured barometric pressure is within the allowable range.
Temperature
• Temperature is displayed in units of 0.1°C (or 0.2°F).
• The displayed temperature value changes to - - - °C (or °F) if a
measured temperature falls outside the range of –10.0°C to 60.0°C
(14.0°F to 140.0°F). The temperature value will reappear as soon as
Barometric Barometric Temperature Temperature
the measured temperature is within the allowable range.
pressure pressure
Display Units
You can select either hectopascals (hPa) or inchesHg (inHg) as the display unit for the measured
barometric pressure, and Celsius (°C) or Fahrenheit (°F) as the display unit for the measured temperature
value. See "To specify temperature, barometric pressure, and altitude display units" (page E-35).
Barometric Pressure Graph
Barometric pressure indicates changes in the atmosphere. By monitoring
Barometric pressure graph Barometric pressure graph
these changes you can predict the weather with reasonable accuracy.
This watch takes barometric pressure readings automatically every two
hours. Readings are used to produce barometric pressure graph and
barometric pressure differential pointer readings.
E-62
Operation Guide 3410
Bearing Angle to
Objective
1. Set the map (page E-56).
2. Place the watch on the map at your current location, and point 12 o'clock at your desired objective on
the map.
3. Press A to store the direction to your objective in bearing memory. Now you can advance towards
your objective while observing the stored direction on the watch display.
Important!
• As you progress, the direction to your bearing will change, so you need to keep updating the
information in bearing memory.
Using Bearing Records
You can use the procedure in this section to create a bearing record of your current bearing reading, along
with the date and time of the reading. You can later recall a record to view it.
Important!
• The watch has memory for storage of up to 40 records of various types. If you perform an operation
that creates a new record while there are already 40 records in memory, the oldest record is deleted
automatically to make room for the new one (page E-70).
1. Take a bearing reading to your objective so it is shown on the display.
2. Without moving the watch, hold down C for at least two seconds.
• REC and Hold will appear on the display fi rst, and then Hold will disappear. Release
disappears.
• The watch will create a record of the current bearing to your objective along with the date and
time, and then return automatically to the direction reading screen.
3. To view a record, enter the Data Recall Mode (page E-26) and use the A and C buttons to scroll
(page E-70).
• The illustration, for example, shows the value you should input and the direction setting you should
select when the map shows a magnetic declination of 1° West.
4. When the setting is the way you want, press E to exit the setting screen.
Digital Compass Precautions
Magnetic North and True North
The northerly direction can be expressed either as magnetic north or true
True north True north
north, which are different from each other. Also, it is important to keep in mind
that magnetic north moves over time.
Magnetic north Magnetic north
• Magnetic north is the north that is indicated by the needle of a compass.
• True north, which is the location of the North Pole of the Earth's axis, is the
north that is normally indicated on maps.
• The difference between magnetic north and true north is called the
"declination". The closer you get to the North Pole, the greater the
Earth Earth
declination angle.
Location
• Taking a direction reading when you are near a source of strong magnetism can cause large errors in
readings. Because of this, you should avoid taking direction readings while in the vicinity of the
following types of objects: permanent magnets (magnetic necklaces, etc.), concentrations of metal
(metal doors, lockers, etc.), high tension wires, aerial wires, household appliances (TVs, personal
computers, washing machines, freezers, etc.).
• Accurate direction readings are impossible while in a train, boat, air plane, etc.
• Accurate readings are also impossible indoors, especially inside ferroconcrete structures. This is
because the metal framework of such structures picks up magnetism from appliances, etc.

Taking Barometric Pressure and Temperature Readings

This watch uses a pressure sensor to measure air pressure (barometric pressure) and a temperature
sensor to measure temperature.
To take barometric pressure and temperature readings
Pressure Pressure Barometric Barometric
differential differential pressure graph pressure graph
Enter the Barometer/Thermometer Mode (page E-27).
pointer pointer
• This will automatically start a barometric pressure/temperature reading
operation, and the results will appear on the display in about one
second.
• Readings will continue to be taken about every fi ve seconds for the
fi rst three minutes, and then about every two minutes thereafter.
• You can restart the reading operation from the beginning at any time
by pressing C.
Note
Press D to return to the Timekeeping Mode.
•
Barometric Barometric
• The watch will return to the Timekeeping Mode automatically if you do
pressure pressure
Temperature Temperature
not perform any operation for about 1 hour after entering the
Barometer/Thermometer Mode.
Reading the Barometric Pressure Graph
The barometric pressure graph shows a chronological history of pressure readings.
• When display of the barometric change indicator is disabled, the graph shows the results of up to 21
barometric pressure readings (42 hours).
• When display of the barometric change indicator is enabled, the graph shows the results of up to 11
barometric pressure readings (22 hours).
• The horizontal axis of the graph represents time, with each dot standing for
Barometric Barometric
two hours. The rightmost dot represents the most recent reading.
pressure pressure
• The vertical axis of the graph represents barometric pressure, with each
dot standing for the relative difference between its reading and that of the
dots next to it. Each dot represents 1 hPa.
Time Time
The following shows how to interpret the data that appears on the barometric pressure graph.
Rising barometric pressure indicates that upcoming weather will improve.
Falling barometric pressure indicates that upcoming weather will deteriorate.
Note
• If there are sudden changes in weather or temperature, the graph line of past
reading 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 reading to be skipped,
with the corresponding point on the barometric pressure graph being left blank.
– Barometric reading that is out of range (260 hPa to 1,100 hPa or 7.65 inHg to
32.45 inHg)
– Sensor malfunction
C
after Hold
E-57
E-59
E-61
Not visible on Not visible on
the display. the display.
E-63