E-64
Barometric Pressure Differential Pointer
This pointer indicates the relative difference between the most recent
barometric pressure reading indicated on the barometric pressure graph
(page E-62), and the current barometric pressure value displayed in the
Barometer/Thermometer Mode (page E-61).
Reading Barometric Pressure Differential Pointer
Pressure differential is indicated in the range of
±10 hPa, in 1-hPa units.
•
The nearby illustration, for example, shows
what the pointer would indicate when the
calculated pressure differential is
approximately – 5 hPa (approximately – 0.15
inHg).
•
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
(1 hPa
=
0.03 inHg).
Barometric
pressure
differential
pointer
Barometric
pressure
differential
pointer
−0.15
−5
−10
−0.3
Barometric pressure
differential pointer
inHg values
hPa values
Current pressure
greater than most
recent measured
pressure
Current pressure
less than most
recent measured
pressure
−0.15
−5
−10
−0.3
Barometric pressure
differential pointer
inHg values
hPa values
Current pressure
greater than most
recent measured
pressure
Current pressure
less than most
recent measured
pressure
E-65
Barometric Pressure Change Indications
Your watch analyzes past barometric pressure readings and uses a barometric pressure change indicator
to inform you about changes in pressure.The watch will beep to let you know when a signifi cant change in
barometric pressure is detected. This means you could start taking barometric pressure readings after
reaching a lodge or camp area, and then check the watch the next morning for changes in pressure, and
plan you day’s activities accordingly. Note that you can enable or disable display of the barometric
pressure change indicator as desired.
Reading the Barometric Pressure Change Indicator
Indicator
Meaning
Sudden fall in pressure.
Sudden rise in pressure.
Sustained rise in pressure, changing to a fall.
Sustained fall in pressure, changing to a rise.
•
The barometric pressure change indicator is not displayed if there has been no noteworthy change in
barometric pressure.
E-66
Important!
•
To ensure proper results, take barometric readings under conditions where the altitude remains
constant.
Example
– In a lodge or campground
– On the ocean
•
A change in altitude causes a change in barometric pressure. Because of this, correct readings are
impossible. Do not take readings while ascending or descending a mountain, etc.
Enabling or Disabling Display of the Barometric Pressure Change Indicator
You can enable or disable display of the barometric pressure change indicator as desired. When display
of the indicator is enabled, the watch will take a barometric pressure reading every two minutes,
regardless of the mode it is in.
•
When
BARO
is shown on the display, it means that barometric pressure change indicator display is
enabled.
To enable or disable the barometric pressure change alert
In the Barometer/Thermometer Mode, hold down
A
for at least two seconds. Keep
A
depressed until
the current setting (
INFO Hold ON
or
INFO Hold OFF
) starts to fl ash on the display.
•
If barometric pressure change indicator display is currently enabled,
BARO
will also appear in the
display.
BARO
will not appear if display is currently disabled.
•
Note that barometric pressure change indicator display will turn off automatically 24 hours after you
turn it on or battery power goes low.
•
Note that time calibration signal reception and power saving (page E-14) are disabled while barometric
pressure change indicator display is enabled.
•
Note that barometric pressure change indicator display cannot be enabled while the watch’s battery is low.
E-67
Using Barometric Pressure and Temperature Records
You can use the procedure in this section to create a barometric pressure and temperature record of your
current readings, 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. While barometric pressure and temperature readings are in progress, hold down
C
for at least two
seconds.
•
REC
and
Hold
will appear on the display fi rst, and then
Hold
will disappear. Release
C
after
Hold
disappears.
•
The watch will create a record of the current barometric pressure and temperature, along with
the date and time, and then return automatically to the barometric pressure/temperature reading
screen.
2. To view a record, enter the Data Recall Mode (page E-26) and use the
A
and
C
buttons to scroll. See
“Viewing Memory Records” (page E-70) for more information.
Pressure Sensor and Temperature Sensor Calibration
The pressure sensor and temperature sensor built into the watch are calibrated at the factory and normally
require no further adjustment. If you notice serious errors in the pressure readings and temperature
readings produced by the watch, you can calibrate the sensor to correct the errors.
Important!
•
Incorrectly calibrating the barometric pressure sensor can result in incorrect readings. Before
performing the calibration procedure, compare the readings produced by the watch with those of
another reliable and accurate barometer.
E-68
•
Incorrectly calibrating the temperature sensor can result in incorrect readings.
Carefully read the following before doing anything.
– Compare the readings produced by the watch with those of another reliable and 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.
To calibrate the pressure sensor and the temperature sensor
1. Take a reading with another measurement device to determine the
exact current barometric pressure or temperature.
2. In the Barometer/Thermometer Mode, hold down
E
for at least two
seconds. You can release
E
after
TEMP
appears.
•
The current temperature calibration setting will fl ash in the display
at this time.
3. Press
D
to move the fl ashing between the temperature value and
barometric pressure value, to select the one you want to calibrate.
4. Use
A
(+) and
C
(–) to select the temperature and barometric
pressure value display units as shown below.
Temperature 0.1°C (0.2°F)
Barometric Pressure 1 hPa (0.05 inHg)
•
To return the currently fl ashing value to its initial factory default
setting, press
A
and
C
at the same time.
OFF
will appear at
the fl ashing location for about one second, followed by the initial
default value.
5. Press
E
to return to the Barometer/Thermometer Mode screen.
E-69
Barometer and Thermometer Precautions
•
The pressure sensor built into this watch measures changes in air pressure, which you can then apply
to your own weather predictions. It is not intended for use as a precision instrument in offi cial weather
prediction or reporting applications.
•
Sudden temperature changes can affect pressure sensor readings. Because of this, there may be
some error in the readings produced by the watch.
•
Temperature reading are affected by your body temperature, direct sunlight, and moisture. To achieve
a more accurate temperature reading, remove the watch from your wrist, place it in a well ventilated
location out of direct sunlight, and wipe all moisture from the case. It takes approximately 20 to 30
minutes for the case of the watch to reach the surrounding temperature.
E-70
Viewing Memory Records
You can use the Data Recall Mode to recall and view the following type of data in watch memory.
•
Date/Time Records (page E-30)
•
Altitude Records (page E-45)
•
Historical altitude values (page E-46)
•
Direction Records (page E-56)
•
Barometric Pressure and Temperature Records (page E-67)
To view data in watch memory
1. Use
D
to select the Data Recall Mode (
REC
) as shown on page E-26.
•
About one second after
REC
appears on the display, the display will change to show the fi rst
record of the memory area you were viewing when you last exited the Data Recall Mode.
2. Use
A
and
C
to scroll through the screens for an area and display the one you want.
•
Records are assigned numbers in the sequence they are recorded. If you create a new record (by
saving data) while there are already 40 records in memory, record number 01 (the oldest record)
will be deleted automatically to make room for the new record.
•
If you attempt to recall a record while there are no records in memory, a blank record will appear
on the display.
•
Holding the
A
or
C
button will scroll through the records at high speed.
E-71
Historical
altitude
values (4)
* Segment indicating currently displayed record flashes.
Number of
records
*
Records (40
maximum)
Currently
displayed
record
Operation Guide 3410
