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USER’S GUIDE 2471
2
• The COMP indicator flashes on the display while a measurement is in
progress.
• The direction value that appears on the display represents the clockwise
angle formed between magnetic north (which is 0 degrees) and the
displayed direction.
Note
• Note that taking a measurement while the watch is not horizontal (in
relation to the horizon) can result in large measurement error.
• The margin of error for the direction value is ±11 degrees. If the indicated
direction is northwest (NW) and 315 degrees, for example, the actual
direction can be anywhere from 304 to 326 degrees.
• Digital Compass operation is automatically interrupted whenever an alarm
(Daily Alarm or Hourly Time Signal) sounds. If this happens, start the Digital
Compass operation again from the beginning.
• The following table shows the meanings of each of the direction
abbreviations that appear on the display.
• See “Digital Compass Precautions” for other important information about
taking direction readings.
Direction
Meaning
Direction
Meaning
Direction
Meaning
Direction
Meaning
NNE
ESE
SSW
WNW
NE
SE
SW
NW
North-
northeast
East-
southeast
South-
southwest
West-
northwest
Northeast
Southeast
Southwest
Northwest
East-
northeast
South-
southeast
West-
southwest
North-
northwest
ENE
SSE
WSW
NNW
North
East
South
West
N
E
S
W
Barometer/Thermometer
This watch uses a pressure sensor to measure air pressure (barometric
pressure) and a temperature sensor to measure temperature.
• You can calibrate the temperature sensor and the pressure sensor if you
suspect that readings are incorrect.
To take Barometric Pressure and Temperature Readings
Pressing C in the Timekeeping Mode or in any
of the other sensor modes enters the Barometer/
Thermometer Mode. The watch automatically
starts barometric pressure and temperature
measurement, and displays the results.
• Barometric pressure is displayed in units of
1hPa/mb (or 0.05 inHg).
• Temperature is displayed in units of 0.1°C (or
0.2°F).
Barometric pressure graph
(unit: 1hPa (mb)/0.05 inHg)
Temperature
Barometric pressure
• The displayed barometric pressure value changes toxxxx hPa/mb (or
inHg) if a measured barometric pressure falls outside the range of 260 hPa/
mb to 1100 hPa/mb (7.65 inHg to 32.45 inHg). The barometric pressure
value will be displayed again as soon as the measured barometric pressure
is within the allowable range.
• The displayed temperature value changes to
xx. x °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 be displayed again as soon as the
measured temperature is within the allowable range.
• Some countries refer to the barometric pressure unit hecto-pascal (hPa) as
millibars (mb). It really makes no difference, because 1hPa = 1mb. In this
manual, we use hPa/mb or hPa (mb).
• See “About Barometric and Temperature Measurements” for important
precautions.
Barometric Pressure Graph
Barometric pressure indicates changes in the atmosphere. By monitoring
these changes you can predict the weather with reasonable accuracy. The
barometric pressure graph shows the barometric readings for the past 26
hours. The flashing point on the right of the display is the point for the newest
measurement. Note that pressure graph readings are relative to the newest
measurement point. One dot above the newest point is plus 1hPa(mb)/
0.05 inHg, while one dot below is minus 1hPa(mb)/0.05 inHg. The following
shows how to interpret the data that appears on the barometric pressure
graph.
A rising graph generally means improving weather.
A falling graph generally means deteriorating weather.
Note that if there are sudden changes in weather 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
• Dead batteries
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 for the first three minutes.
• The BARO indicator flashes on the display while a measurement is in
progress.
Not visible on
the display.
• The barometer automatically takes measurements every two hours (starting
from midnight), regardless of what mode you are in. The results of these
measurements are used for the barometric pressure graph.
• You can also perform a barometric pressure and temperature measurement
at any time by pressing C in the Barometer/Thermometer Mode.
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 official weather prediction
or reporting applications.
• Sudden temperature changes can affect pressure sensor readings.
• Temperature measurements are affected by your body temperature (while
you are wearing the watch), direct sunlight, and moisture. To achieve a
more accurate temperature measurement, remove the watch from your
wrist, place it in a well ventilated location out of direct sunlight, and wipe off
all moisture from the case. It takes approximately 20 to 30 minutes for the
case of the watch to reach the actual surrounding temperature.
• You can change the measured barometric pressure unit between hecto-
pascals/millibars (hPa/mb) and inchesHg (inHg). See “Changing the
Barometric Pressure and Temperature Units” for details.
• You can change the measured temperature value displayed by this watch
between Celsius (°C) and Fahrenheit (°F). See “Changing the Barometric
Pressure and Temperature Units”.
Altimeter
A built-in altimeter uses a pressure sensor to detect the current air pressure,
which is then used to estimate the current altitude. The watch is pre-
programmed with ISA (International Standard Atmosphere) preset values,
which are used to convert air pressure readings to altitude values. If you
preset a reference altitude, the watch will also calculate the current relative
altitude based on your preset value. Altimeter functions also include data
storage memory and an altitude alarm.
Important!
• This watch estimates altitude based on air pressure. This means that
altitude readings for the same location may vary if air pressure changes.
• This watch employs a semiconductor pressure sensor, which is affected by
temperature changes. When taking altitude measurements, be sure to do
so while ensuring that the watch is not exposed to temperature changes.
• To avoid the effect of sudden temperature changes on measurement, wear
the watch so it is in direct contact with your wrist during measurement.
• Do not rely upon this watch for altitude measurements or perform button
operations while engaging in sports where there are sudden altitude
changes, while sky diving, hang gliding, or paragliding, or while riding a
gyrocopter, glider, or any other aircraft.
• 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 Works
With the Preset Values (No Reference Altitude)
• The watch measures the air pressure at your current location and uses the
built-in ISA values to convert it to the equivalent altitude.