G-Shock GWN1000-9A - Manual (Page 7)

E-48
Note
• The barometric pressure graph is not displayed while the barometric pressure change indicator is
displayed.
• While the watch is in the Barometer Mode, the watch will update the display barometric pressure value
at regular intervals (every fi ve seconds for the fi rst three minutes and then every two minutes for the
remainder of the hour). Since the barometric pressure graph show automatic readings taken every two
hours, the graph is updated only at two-hour intervals.
• Large changes in barometric pressure may cause past readings to run off the
top or bottom of the graph display area.
• 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
Not visible on
the display. Not visible on
the display.
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Barometric Pressure Change Indications
Whenever your watch detects a signifi cant change in air pressure readings (due to sudden ascent or
descent, or to the passage of a low pressure or high pressure area), it beeps to let you know. Also, an
arrow fl ashes on the digital display and the small hand points to the arrow mark. All of this is intended to
let you know what a signifi cant pressure change has occurred so you can take any action that might be
required.
The barometric pressure change indicator is displayed in the Barometer Mode and while the barometric
pressure graph is displayed in the Timekeeping Mode (page E-33).
• For example, you could enable the barometric pressure change indicator after arriving at a lodge or
campsite. Then, before setting out the following day, you could check for changes in barometric
pressure, which will give you some idea of upcoming weather conditions.
Reading the Barometric Pressure Change Indicator
Small Hand and Digital Display 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. In such a case, the small hand is at 6 o’clock.
E-50
Important!
• To ensure proper results, take barometric readings under conditions where the altitude remains
constant.
• A change in altitude causes a change in barometric pressure. This means that correct barometric
pressure readings are not possible while you are changing altitudes. To avoid possible confusion, it is
probably best to disable the barometric pressure change indicator while you are on the move during
your climb.
To enable or disable the barometric pressure change indicator
In the Barometer Mode or the Timekeeping Mode, hold down
C for at least two seconds until INFO
appears on the digital display, and the current indicator setting toggles between ON (enabled) and OFF
(disabled).
• The small hand acts as a barometric pressure change indicator while ON, and a Tide Graph while
OFF.
• BARO is shown on the digital display while the indicator is enabled.
• Note that barometric pressure change indicator display will turn off automatically 24 hours after
you turn it on or battery power goes low.
• Enabling or disabling the Barometric Pressure Change Indicator in the Barometer Mode will also
toggle the second hand function between Barometric Pressure Differential Pointer (Barometric
Pressure Change Indicator ON) and current second count indication (Barometric Pressure
Change Indicator OFF) (page E-45). After selecting the Barometric Pressure Change Indicator
setting you want, use
C to select the second hand function setting you want.
• Note that time calibration signal reception and power saving (page E-19) 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-51
Pressure Sensor Calibration
The pressure 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 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.
To calibrate the pressure sensor
1. Take a reading with another measurement device to determine the
exact current barometric pressure.
2. Use A to enter the Barometer Mode (BARO), as shown on page
E-31.
3. Pull out the crown. This will cause the current barometric pressure
reading value to fl ash on the digital display.
• The timekeeping (hour, minute, second) hands will move to 2
o’clock.
4. Rotate the crown to adjust the barometric pressure value.
• You can also use HS1 high-speed movement (page E-6) to change
this setting.
• The calibration unit is 1 hPa (0.05 inHg).
• To return the setting to OFF (uncalibrated), press A and C at the
same time.
5. After you complete calibration, push the crown back in.
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Barometer 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.
• Extreme temperature changes can affect pressure sensor readings. Because of this, there may be
some error in the readings produced by the watch.
E-53
Taking Direction Readings
You can use the Digital Compass Mode to determine the direction of north, and to check your bearing to a
destination.
• For information about what you can do to improve digital compass reading accuracy, see “Calibrating
the Bearing Sensor” (page E-56) and “Digital Compass Precautions” (page E-60).
To take a direction reading
1. Place the watch on a fl at surface. If you are wearing the watch, make sure that your wrist is horizontal
(in relation to the horizon).
2. Point the 12 o’clock position of the watch in the direction whose reading you want to take.
3. In the Timekeeping Mode or any sensor mode, press A a number of times until COMP (Digital
Compass Mode) appears on the digital display.
• In a non-sensor mode, hold down B for about two seconds to enter the Timekeeping Mode. Next,
perform the above step.
• After you enter the Digital Compass Mode (COMP), the watch will start taking bearing readings.
• Starting a digital compass operation will cause the second hand to move momentarily to the
12 o’clock position. Following the digital compass operation, the second hand will point in the
direction of magnetic north. The bearing and direction angle will appear on the digital display.
E-54
315°
0°
Objective Bearing Indication
Meaning
N: North
E: East
W: West
S: South
Bearing to Objective:
Northwest
Bearing Angle
to Objective
North
Note
• After the initial reading is displayed, the watch will continue to take readings and display results
about every second for about the next 60 seconds.
• Pressing C or L, or rotating the crown while a reading operation is in progress will extend the
operation for approximately 60 seconds from point the button was pressed or the crown was
rotated.
• The watch will return to the Timekeeping Mode about 60 seconds after the direction reading
operation is complete.
• Pressing B while a reading operation is in progress will stop the operation and enter the
Timekeeping Mode.
E-55
Important!
• If the second hand does not point exactly at 12 o’clock after you perform step 3 above, perform the
operation under “Hand Home Position Adjustment” (page E-39) to adjust it.
• If the digital display contents start to fl ash after you perform a reading operation, it means that
abnormal magnetism has been detected. Move away from any potential source of strong magnetism
and try taking a reading again. If the problem occurs when you try again, continue to keep away from
the source of strong magnetism, perform bidirectional calibration, and then try taking a reading again.
For more information, refer to “To perform bidirectional calibration” (page E-57) and “Location” (page
E-60).
Digital Compass Readings
• After the fi rst reading is obtained, the watch will continue to take digital compass readings automatically
each second for up to 60 seconds. After that, the reading operation will stop automatically.
• The auto light switch is disabled during the 60 seconds that digital compass readings are being taken.
• The margin of error for the angle value and the direction indicator is ±10 degrees while the watch is
horizontal (in relation to the horizon). If the indicated direction is northwest (NW) and 315 degrees, for
example, the actual direction can be anywhere from 305 to 325 degrees.
• Note that taking a direction reading while the watch is not horizontal (in relation to the horizon) can
result in large direction reading error.
• You can calibrate the bearing sensor if you suspect the direction reading is incorrect.
• Any ongoing direction reading operation is paused temporarily while the watch is performing an alert
operation (daily alarm, Hourly Time Signal, countdown timer alarm) or while illumination is turned on (by
pressing
L). The direction reading operation resumes for its remaining duration after the operation
that caused it to pause is fi nished.
• See “Digital Compass Precautions” (page E-60) for important information about taking direction readings.
Operation Guide 5371