Not visible on the display.

USER’S GUIDE 2471

•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.

Direction

Meaning

Direction

Meaning

Direction

Meaning

Direction

Meaning

N

North

NNE

North-

NE

Northeast

ENE

East-

northeast

northeast

 

 

 

 

 

 

E

East

ESE

East-

SE

Southeast

SSE

South-

southeast

southeast

 

 

 

 

 

 

S

South

SSW

South-

SW

Southwest

WSW

West-

southwest

southwest

 

 

 

 

 

 

W

West

WNW

West-

NW

Northwest

NNW

North-

northwest

northwest

 

 

 

 

 

 

•See “Digital Compass Precautions” for other important information about taking direction readings.

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

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.

•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-

Barometric pressure graph (unit: 1hPa (mb)/0.05 inHg)

Temperature

Barometric pressure

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).

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 preprogrammed with ISA (International Standard Atmosphere) preset values,

•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)/

0.05inHg, 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.

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.

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