MO0602-EA

Operation Guide 3043

Getting Acquainted

Congratulations upon your selection of this CASIO watch. To get the most out of your purchase, be sure to read this manual carefully.
If the display of the watch is blank.
If the display of the watch is blank, it means that the watchs Power Saving function has turned off the display to conserve power. See Power Saving for more information. Warning! The measurement functions built into this watch are not intended for taking measurements that require professional or industrial precision. Values produced by this watch should be considered as reasonable representations only. When engaging in mountain climbing or other activities in which losing your way can create a dangerous or life-threatening situation, always be sure to use a second compass to confirm direction readings. CASIO COMPUTER CO., LTD. assumes no responsibility for any loss, or any claims by third parties that may arise through the use of this watch.

Applications

The built-in sensors of this watch measure direction, barometric pressure, temperature and altitude. Measured values are then shown on the display. Such features make this watch useful when hiking, mountain climbing, or when engaging in other such outdoor activities.
Keep the watch exposed to bright light

Bright light

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Solar cell

The electricity generated by the solar cell of the watch is stored by a built-in battery. Leaving or using the watch where it is not exposed to light causes the battery to run down. Make sure the watch is exposed to light as much as possible. When you are not wearing the watch on your wrist, position the face so it is pointed at a source of bright light. You should try to keep the watch outside of your sleeve as much as possible. Charging is reduced significantly if the face is only partially covered.

About This Manual

Button operations are indicated using the letters shown in the illustration. Each section of this manual provides you with the information you need to perform operations in each mode. Further details and technical information can be found in the Reference section.
The watch continues to operate, even when it is not exposed to light. Leaving the watch in the dark can cause the battery to run down, which will cause some watch functions to be disabled. If the battery goes dead, you will have to re-configure watch settings after recharging. To ensure normal watch operation, be sure to keep it exposed to light as much as possible.
(Light) Battery charges in the light.
Solar cell (Converts light to electrical power.)
Battery discharges in the dark.
Electrical energy All functions enabled

LEVEL 1 LEVEL 2 LEVEL 3

LEVEL 1 LEVEL 2 Some functions disabled

Charge LEVEL 4

Rechargeable battery
Dis- LEVEL 3 charge LEVEL 4
The actual level at which some functions are disabled depends on the watch model. Frequent display illumination can run down the battery quickly and require charging. The following guidelines give an idea of the charging time required to recover from a single illumination operation. Approximately five minutes exposure to bright sunlight coming in through a window Approximately 50 minutes exposure to indoor fluorescent lighting Be sure to read Power Supply for important information you need to know when exposing the watch to bright light.

General Guide

The illustration below shows which buttons you need to press to navigate between modes. Timekeeping Mode In any mode, press L to illuminate the display.
World Time Mode Data Recall Mode

Press D.

You can use buttons A, B, and C to enter a sensor mode directly from the Timekeeping Mode or from another sensor mode. To enter a sensor mode from the Data Recall, World Time, Stopwatch, Countdown Timer, Alarm, or Receive Mode, first enter the Timekeeping Mode and then press the applicable button. Sensor Modes
Press A. Press B. Press C.

Digital Compass Mode

Barometer/ Thermometer Mode

Altimeter Mode

Stopwatch Mode

Countdown Timer Mode

Alarm Mode Receive Mode
Radio-controlled Atomic Timekeeping
This watch receives a time calibration signal and updates its time setting accordingly. This watch is designed to pick up the time calibration signal transmitted in Germany (Mainflingen), England (Rugby), and the United States (Fort Collins) and the time calibration signals transmitted in Japan. Signal reception normally is better at night than during the day. Time calibration signal reception takes from two to seven minutes, but in some cases it can take as long as 14 minutes. Take care that you do not perform any button operations or move the watch during this time. The time calibration signal the watch will attempt to pick up depends on its current Home City code setting as shown below. Home City Code LON, PAR, BER, ATH TYO, SEL NYC, CHI, DEN, LAX Reception Ranges Transmitter Rugby (England) Mainflingen (Germany) Fukushima (Japan) Fukuoka/Saga (Japan) Fort Collins, Colorado (the United States) Frequency 60.0 kHz 77.5 kHz 40.0 kHz 60.0 kHz 60.0 kHz

Time Calibration Signal Reception
There are two different methods you can use to receive the time calibration signal: auto receive and manual receive. Auto Receive With auto receive, the watch receives the time calibration signal automatically up to six times a day. When any auto receive is successful, the remaining auto receive operations are not performed. For more information, see About Auto Receive. Manual Receive Manual receive lets you start a time calibration receive operation with the press of a button. For more information, see To perform manual receive. Important! When getting ready to receive the time calibration signal, position the watch as shown in the nearby illustration, with its 12 oclock side facing towards a window. Make sure there are no metal objects nearby.

12 oclock or

The watch should not be facing the wrong way. Proper signal reception can be difficult or even impossible under the conditions listed below.
Inside or among buildings

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Signal reception may not be possible at the distances noted below during certain times of the year or day. Radio interference may also cause problems with reception. Mainflingen (Germany) or Rugby (England) transmitters: 500 kilometers (310 miles) Fort Collins (United States) transmitter: 600 miles (1,000 kilometers) Fukushima or Fukuoka/Saga (Japan) transmitters: 500 kilometers (310 miles) Even when the watch is within the reception range of the transmitter, signal reception will be impossible if the signal is blocked by mountains or other geological formations between the watch and signal source. Signal reception is affected by weather, atmospheric conditions, and seasonal changes. See the information under Signal Reception Troubleshooting if you experience problems with time calibration signal reception.

About Auto Receive

The watch receives the time calibration signal automatically up to six times a day. When any auto receive is successful, the remaining auto receive operations are not performed. The reception schedule (calibration times) depends on your currently selected Home City, and whether standard time or Daylight Saving Time is selected for your Home City. Auto Receive Start Times 1:00 am 2:00 am 3:00 am 4:00 am 5:00 am Midnight LON Standard Time Daylight Saving Time 2:00 am 3:00 am 4:00 am 5:00 am Midnight 1:00 am next day PAR, Standard Time 2:00 am 3:00 am 4:00 am 5:00 am Midnight 1:00 am next day BER Daylight Saving Time 3:00 am 4:00 am 5:00 am Midnight 1:00 am 2:00 am next day next day ATH Standard Time 3:00 am 4:00 am 5:00 am Midnight 1:00 am 2:00 am next day next day Daylight Saving Time 4:00 am 5:00 am Midnight 1:00 am 2:00 am 3:00 am next day next day next day TYO, Standard Time Midnight 1:00 am 2:00 am 3:00 am 4:00 am 5:00 am SEL NYC, Standard Time and Midnight 1:00 am 2:00 am 3:00 am 4:00 am 5:00 am CHI, Daylight Saving Time DEN, LAX Your Home City Note When a calibration time is reached, the watch will receive the calibration signal only if it is in either the Timekeeping Mode or World time Mode. Reception is not performed if a calibration time is reached while you are configuring settings. Auto receive of the calibration signal is designed to be performed early in the morning, while you sleep (provided that the Timekeeping Mode time is set correctly). Before going to bed for the night, remove the watch from your wrist, and put it in a location where it can receive the signal easily.

Even in an area where signal strength is strong, it takes about 10 seconds for signal reception to stabilize enough for the receiving indicator to indicate signal strength. Use the receiving indicator as a guide for checking signal strength and for finding the best location for the watch during signal receive operations. Following reception of the time calibration signal and calibration of the watchs time setting, the Level 5 receiving indicator will remain on the display in all modes. The Level 5 receiving indicator will not be displayed if signal reception was unsuccessful or after you adjust the current time setting manually. The Level 5 receiving indicator is displayed only when the watch is able to receive both time and date data successfully. It does not appear when only time data is received. The Level 5 receiving indicator indicates that at least one of the auto calibration signal receive operations was successful. Note, however, that the Level 5 receiving indicator disappears from the display each day when the first auto receive operation of the day is performed.
To perform manual receive

Receiving

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Receive successful

Receive failed
1. Enter the Receive Mode. 2. Place the watch on a stable surface so its 12 oclock side is facing towards a window. 3. Hold down C for about two seconds until RC starts to flash on the display. Time calibration signal reception takes from two to seven minutes. Take care that you do not perform any button operations or move the watch during this time. If the receive operation is successful, the reception date and time appear on the display, along with the GET indicator. The watch will enter the Receive Mode if you press C or if you do not perform any button operation for about one or two minutes. If the current reception fails but a previous reception was successful, the display shows the previous receptions date and time, and the ERR indicator. indicates that none of the reception operations were successful. The watch will enter the Receive Mode without changing the time setting if you press C or if you do not perform any button operation for about one or two minutes. Note To interrupt a receive operation and return to the Receive Mode, press C.

Barometric Pressure Differential Pointer
This pointer indicates the relative difference between the most recent barometric pressure reading indicated on the barometric pressure graph, and the current barometric pressure value displayed in the Barometer/ Thermometer Mode. Pressure differential is indicated in the range of 15 hPa, in 1-hPa units. The barometric pressure differential pointer is not displayed when the displayed current barometric value is outside of the allowable measurement range (260 to 1,100 hPa). Barometric pressure is calculated and displayed using hPa as the standard. The barometric pressure differential can also be read in inHg units as shown in the illustration.
Current pressure greater than most recent measured pressure
Barometric pressure differential pointer

hPa values

Pressure differential examples in the illustration are indicated in 10 hPa/0.3 inHg steps.
Current pressure less than most recent measured pressure
To turn display of the barometric pressure differential pointer on and off
1. In the Barometer/Thermometer Mode, hold down E until SET appears in the upper display area. 2. Release E, and wait for four or five more seconds until either OFF or the current reference temperature value (if set) starts to flash. This is the setting screen. 3. Press D twice to display the pointer on/off setting screen. 4. Press C to toggle display of the barometric pressure differential pointer on (ON displayed) and off (OFF displayed). 5. When the setting is the way you want, press E to exit the setting screen.
Displaying Your Current Altitude
You can use the procedure described in this section to display your current altitude. If you leave the watch in the Altimeter Mode, it will update the displayed altitude value regularly, and indicate reading-to-reading changes in the altitude graph at the top of the display. Important! The procedure in this section simply displays values indicating your current altitude, without storing them in watch memory. For information about recording altitude readings in watch memory, see Saving Altitude Data.
About Barometric and Temperature Measurements
Altitude differential pointer Timekeeping Mode time

Altimeter

The watchs altimeter uses a pressure sensor to detect current air pressure, which is then used to estimate the current altitude based on ISA (International Standard Atmosphere) preset values. You can also specify a reference altitude, which the watch will use to calculate your current altitude based on the value you specify. Altimeter functions also include storage of measurement data in 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. The semiconductor pressure sensor used by the watch for altitude measurements is also affected by temperature. When taking altitude measurements, make sure the watch is not subjected to temperature changes. To avoid the effect of sudden temperature changes during measurement, keep the watch on your wrist in direct contact with your skin. Do not rely upon this watch for altitude measurements or perform button operations while sky diving, hang gliding, or paragliding, while riding a gyrocopter, glider, or any other aircraft, or while engaging in any other activity where there is the chance of sudden altitude changes. 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.

Auto-repeat

Whenever zero is reached, the watch beeps and auto-repeat automatically restarts the countdown from the countdown start time you set. When the countdown reaches zero while auto-repeat is turned off, the watch will beep and then display the countdown start time (without restarting the countdown). Auto-repeat will repeat up to 10 times.

Progress Beeper

When the progress beeper is turned on, the watch beeps at minute 10, 5, 4, 3, 2, and 1 of the countdown, and at second 50, 40, 30, 20, 10, 5, 4, 3, 2, and 1 of the final minute of the countdown.
To configure countdown start time and auto-repeat settings
1. While the countdown start time is on the display in the Countdown Timer Mode, hold down E until the minute setting of the countdown start time starts to flash, which indicates the setting screen. If the countdown start time is not displayed, use the procedure under To use the countdown timer to display it. 2. Press D to toggle between the countdown starting time setting screen and the autorepeat setting screen.

Stopwatch

Minutes Hours 1/100 second
Seconds Timekeeping Mode time
The stopwatch lets you measure elapsed time, split times, and two finishes. The display range of the stopwatch is 9 hours, 59 minutes, 59.99 seconds. The stopwatch continues to run, restarting from zero after it reaches its limit, until you stop it. The stopwatch measurement operation continues even if you exit the Stopwatch Mode. Exiting the Stopwatch Mode while a split time is frozen on the display clears the split time and returns to elapsed time measurement. All of the operations in this section are performed in the Stopwatch Mode, which you enter by pressing D.
3. Perform the following operations, depending on which setting is currently selected on the display. While the minute setting is flashing, use C (+) or A () to change it. While the auto-repeat on/off setting ( or ) is flashing on the ) and off ( ). display, press C to toggle auto-repeat on ( 4. Press E to exit the setting screen.
To turn the progress beeper on and off
Progress beeper on indicator

To measure times with the stopwatch
Elapsed Time C C Start Stop Split Time C A Start Split (sj displayed) Two Finishes C A Start Split First runner finishes. Display time of first runner.

C Re-start

C Stop

A Clear

To use the countdown timer
A Split release C Stop A Clear Press C while in the Countdown Timer Mode to start the countdown timer. When the countdown reaches zero, the alarm sounds for five seconds or until you stop it by pressing any button. Press C while a countdown operation is in progress to pause it. Press C again to resume the countdown. The countdown timer operation continues even if you exit the Countdown Timer Mode. To stop a countdown operation completely, first pause it (by pressing C), and then press A. This returns the countdown time to its starting value. Frequent use of auto-repeat and the alarm runs down the battery.
C Stop Second runner finishes.
A Split release Display time of second runner.

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Pressing A while the countdown start time is on the display or while a countdown timer operation is in progress in the Countdown Timer Mode toggles progress beeper operation on ( displayed) and off ( not displayed).

Alarms

Alarm on indicator Hourly time signal on indicator Alarm number
Timekeeping Mode time Alarm time (Hour : Minutes)
You can set five independent daily alarms. When an alarm is turned on, the alarm tone sounds when the alarm time is reached. You can also turn on an Hourly Time Signal, which will cause the watch to beep twice every hour on the hour. The alarm number (AL1 through AL5) indicates an alarm screen. SIG is shown when the Hourly Time Signal screen is on the display. When you enter the Alarm Mode, the data you were viewing when you last exited the mode appears first. All of the operations in this section are performed in the Alarm Mode, which you enter by pressing D.
About the Auto Light Switch
Turning on the auto light switch causes illumination to turn on, whenever you position your wrist as described below in any mode. Note that this watch features a Full Auto EL Light, so the auto light switch operates only when available light is below a certain level. It does not illuminate the display under bright light. The auto light switch is always disabled, regardless of its on/off setting, when any one of the following conditions exists. While an alarm is sounding During sensor measurement While a bearing sensor calibration operation is being performed in the Digital Compass Mode While a receive operation is in progress in the Receive Mode Moving the watch to a position that is parallel to the ground and then tilting it towards you more than 40 degrees causes illumination to turn on. Wear the watch on the outside of your wrist.

Illumination

Auto light switch on indicator
The display of the watch is illuminated using an EL (electro-luminescent) panel for easy reading in the dark. The watchs auto light switch turns on illumination automatically when you angle the watch towards your face. The auto light switch must be turned on (indicated by the auto light switch on indicator) for it to operate. You can specify 1.5 seconds or 2.5 seconds as the illumination duration. See Illumination Precautions for other important information about using illumination.

Questions & Answers

Question: What causes incorrect direction readings? Answer: Incorrect bidirectional calibration. Perform bidirectional calibration. Nearby source of strong magnetism, such as a household appliance, a large steel bridge, a steel beam, overhead wires, etc., or an attempt to perform direction measurement on a train, boat, etc. Move away from large metal objects and try again. Note that digital compass operation cannot be performed inside a train, boat, etc. Question: What causes different direction readings to produce different results at the same location ? Answer: Magnetism generated by nearby high-tension wires is interfering with detection of terrestrial magnetism. Move away from the high-tension wires and try again. Question: Why am I having problems taking direction readings indoors ? Answer: A TV, personal computer, speakers, or some other object is interfering with terrestrial magnetism readings. Move away from the object causing the interference or take the direction reading outdoors. Indoor direction readings are particularly difficult inside ferro-concrete structures. Remember that you will not be able to take direction readings inside of trains, airplanes, etc.
To turn on illumination manually
Press L in any mode to illuminate the display. The above operation turns on illumination regardless of the current auto light switch setting. Illumination is disabled during time calibration signal reception, while configuring sensor measurement mode settings, and during bearing sensor calibration.

Power Supply

Question: How does the barometer work? Answer: Barometric pressure indicates changes in the atmosphere, and by monitoring these changes you can predict the weather with reasonable accuracy. Rising atmospheric pressure indicates good weather, while falling pressure indicates deteriorating weather conditions. The barometric pressures that you see in the newspaper and on the TV weather report are measurements corrected to values measured at 0 m sea level. Question: How does the altimeter work? Answer: Generally, air pressure and temperature decrease as altitude increases. This watch bases its altitude measurements on International Standard Atmosphere (ISA) values stipulated by the International Civil Aviation Organization (ICAO). These values define relationships between altitude, air pressure, and temperature.

Battery Power Indicator and Recover Indicator
The battery power indicator on the display shows you the current status of the rechargeable batterys power. Level 3

Battery Power Indicator

Function Status All functions enabled. All functions enabled. Auto and manual receive, illumination, beeper, and sensor operation disabled. Except for timekeeping and indicator, all the functions and display indicators are disabled. All functions disabled.

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Height of building 130 m (relative altitude)

Recover indicator

Rooftop at an altitude of 230 m above sea level (absolute altitude)

(Charge Soon Alert)

Sea Level Precautions Concerning Simultaneous Measurement of Altitude and Temperature Though you can perform altitude and temperature measurements at the same time, you should remember that each of these measurements requires different conditions for best results. With temperature measurement, it is best to remove the watch from your wrist in order to eliminate the effects of body heat. In the case of altitude measurement, on the other hand, it is better to leave the watch on your wrist, because doing so keeps the watch at a constant temperature, which contributes to more accurate altitude measurements. The following describes what you should do to give priority to either altitude or temperature. To give altitude measurement priority, leave the watch on your wrist or in any other location where the temperature of the watch is kept constant. To give temperature measurement priority, remove the watch from your wrist and allow it to hang freely from your bag or in another location where it is not exposed to direct sunlight. Note that removing the watch from your wrist can momentarily affect pressure sensor readings.
The flashing LOW indicator at Level 3 tells you that battery power is very low, and that exposure to bright light for charging is required as soon as possible. At Level 5, all functions are disabled and settings return to their initial factory defaults. Once the battery reaches Level 2 (indicated by M indicator) after falling to Level 4, reconfigure the current time, date, and other settings. Display indicators reappear as soon as the battery is charged from Level 5 to Level 2. Leaving the watch exposed to direct sunlight or some other very strong light source can cause the battery power indicator to show a reading temporarily that is higher than the actual battery level. The correct battery level should be indicated after a few minutes. Performing multiple sensor, illumination, or beeper operations during a short period may cause RECOV to appear on the display. Illumination, alarm, countdown timer alarm, hourly time signal, and sensor operations will be disabled until battery power recovers. After some time, battery power will recover and RECOV will disappear, indicating that the above functions are enabled again.

Even if battery power is at Level 1 or Level 2, the Digital Compass Mode, Barometer/Thermometer Mode, or Altimeter Mode sensor may be disabled if there is not enough voltage available to power it sufficiently. This is indicated by RECOV on the display. If RECOV appears frequently, it probably means that remaining battery power is low. Leave the watch in bright light to allow it to charge.

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Battery power indicator

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Charging Precautions

Certain charging conditions can cause the watch to become very hot. Avoid leaving the watch in the areas described below whenever charging its rechargeable battery. Also note that allowing the watch to become very hot can cause its liquid crystal display to black out. The appearance of the LCD should become normal again when the watch returns to a lower temperature. Warning! Leaving the watch in bright light to charge its rechargeable battery can cause it to become quite hot. Take care when handling the watch to avoid burn injury. The watch can become particularly hot when exposed to the following conditions for long periods. On the dashboard of a car parked in direct sunlight Too close to an incandescent lamp Under direct sunlight
To set the time and date manually
1. In the Timekeeping Mode, hold down E until the city code starts to flash, which indicates the setting screen. 2. Use C and A to select the city code you want. Make sure you select your Home City code before changing any other setting. For full information on city codes, see the City Code Table. 3. Press D to move the flashing in the sequence shown below to select the other settings.
City Code Barometric Pressure Unit DST 12/24-Hour Format Seconds Hour Power Saving Minutes Year

Altitude Unit

Temperature Unit

Charging Guide

After a full charge, timekeeping remains enabled for up to about five months. The following table shows the amount of time the watch needs to be exposed to light each day in order to generate enough power for normal daily operations. Exposure Level (Brightness) Outdoor Sunlight (50,000 lux) Sunlight Through a Window (10,000 lux) Daylight Through a Window on a Cloudy Day (5,000 lux) Indoor Fluorescent Lighting (500 lux) Approximate Exposure Time 5 minutes 24 minutes 48 minutes 8 hours
The following steps explain how to configure timekeeping settings only. 4. When the timekeeping setting you want to change is flashing, use C and/ or A to change it as described below. Screen To do this: Change the city code Cycle between Auto DST (AT), Daylight Saving Time (ON) and Standard Time (OFF). Do this: Use C (east) and A(west). Press C.

80 hours

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The above exposure time values are all for reference only. Actual required exposure times depend on lighting conditions.

Timekeeping

Month Day Day of week
Use the Timekeeping Mode to set and view the current time and date. In the Timekeeping Mode, press E to toggle between the monthday and the day of the week at the top of the display.
Read This Before You Set the Time and Date!
This watch is preset with a number of city codes, each of which represents the time zone where that city is located. When setting the time, it is important that you select the correct city code for your Home City (the city where you normally use the watch). If your location is not included in the preset city codes, select the preset city code that is in the same time zone as your location.
To change the Daylight Saving Time (summer time) setting
1. In the Timekeeping Mode, hold down E until the city code starts to flash, which indicates the setting screen. 2. Press D and the DST setting screen appears. 3. Use C to cycle through the DST settings in the sequence shown below.
Auto DST (AT) DST off (OFF) DST on (ON)

PM indicator

Seconds

Hour : Minutes

Note that all of the times for the World Time Mode city codes are displayed in accordance with the time and date settings you configure in the Timekeeping Mode. After you set your Home City time and date correctly, you can set the watch up for timekeeping with a different city code simply by changing the Home City code in the Timekeeping Mode.
If you change your Home City to one that is within the same transmitter area, the current DST setting will be retained. If you change to a city that is outside your current transmitter area, DST will be turned off automatically. Transmitter area city codes HKG, SEL, and TYO LAX, DEN, CHI NYC, ANC, and HNL , LON, PAR, BER, and ATH All other city codes

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4. When the setting you want is selected, press E to exit the setting screen. The DST indicator appears to indicate that Daylight Saving Time is turned on.
To recover from the sleep state
Perform any one of the following operations. Move the watch to a well-lit area. It can take up to two seconds for the display to turn on. Press any button. Angle the watch towards your face for reading.

Reference

This section contains more detailed and technical information about watch operation. It also contains important precautions and notes about the various features and functions of this watch.
To turn Power Saving on and off

1. In the Timekeeping Mode, hold down E until the city code starts to flash, which indicates the setting screen. 2. Press D nine times until the Power Saving on/off screen appears. 3. Press C to toggle Power Saving on (ON) and off (OFF). 4. Press E to exit the setting screen. The Power Saving on indicator (PS) is on the display in all modes while Power Saving is turned on.

Auto Return Features

Power Saving on indicator
Radio-controlled Atomic Timekeeping Precautions
Strong electrostatic charge can result in the wrong time being set. The time calibration signal bounces off the ionosphere. Because of this, such factors as changes in the reflectivity of the ionosphere, as well as movement of the ionosphere to higher altitudes due to seasonal atmospheric changes or the time of day may change the reception range of the signal and make reception temporarily impossible. Even if the time calibration signal is received properly, certain conditions can cause the time setting to be off by up to one second. The current time setting in accordance with the time calibration signal takes priority over any time settings you make manually. The watch is designed to update the date and day of the week automatically for the period January 1, 2001 to December 31, 2099. Setting of the date by the time calibration signal cannot be performed starting from January 1, 2100. This watch can receive signals that differentiate between leap years and non-leap years. Though this watch is designed to receive both time data (hour, minutes, seconds) and date data (year, month, day), certain signal conditions can limit reception to time data only. If you are in an area where proper time calibration signal reception is impossible, the watch keeps time within 15 seconds a month at normal temperature. If you have problems with proper time calibration signal reception or if the time setting is wrong after signal reception, check your current city code, DST (summer time), and auto receive settings. The Home City setting reverts to the initial default of BER (Berlin) whenever the battery power level drops to Level 5 or when you have the rechargeable battery replaced. If this happens, change the Home City to the setting you want.

Calibrating the Bearing Sensor
Whenever you suspect that direction readings produced by the watch are wrong, you should calibrate it. You can use either one of two calibration procedures: bidirectional calibration or northerly calibration. Use bidirectional calibration when you want to take readings within an area exposed to magnetic force. This type of calibration should be used if the watch becomes magnetized for any reason. With northerly calibration, you teach the watch which way is north (which you have to determine with another compass or some other means). You could use this calibration procedure, for example, to set the watch to indicate true north instead of magnetic north. Important! If you want to perform both bidirectional and northerly calibration, be sure to perform bidirectional calibration first, and then perform northerly calibration. This is necessary because bidirectional calibration cancels any previously set northerly calibration setting. The more correctly you perform bidirectional calibration, the better the accuracy of the bearing sensor readouts. You should perform bidirectional calibration whenever you change environments where you use the bearing sensor, and whenever you feel that the bearing sensor is producing incorrect readings. Precautions about bidirectional calibration You can use any two opposing directions for bidirectional calibration. You must, however, make sure that they are 180 degrees opposite each other. Remember that if you perform the procedure incorrectly, you will get wrong bearing sensor readings. Make sure that you do not move the watch while calibration of either direction is in progress. You should perform bidirectional calibration in an environment that is the same as that where you plan to be taking direction readings. If you plan to take direction readings in an open field, for example, calibrate in an open field.

Illumination Precautions

The electro-luminescent panel that provides illumination loses power after very long use. Illumination may be hard to see when viewed under direct sunlight. Illumination turns off automatically whenever an alarm sounds. The watch may emit an audible sound whenever the display is illuminated. This is due to vibration of the EL panel used for illumination, and does not indicate malfunction. Frequent use of illumination runs down the battery.
Auto light switch precautions
The auto light switch is turned off automatically whenever battery power is at Level 4. Wearing the watch on the inside of your wrist, movement of your arm, or vibration of your arm can cause frequent activation of the auto light switch and illumination of the display. To avoid running down the battery, turn off the auto light switch whenever engaging in activities that might cause frequent illumination of the display. Note that wearing the watch under your sleeve while the auto light switch is turned on can cause frequent illumination of the display and can run down the battery.

4. Use C (+) and A () to set the calibration value in the units shown below. Temperature 0.1C (0.2F) Barometric Pressure 1 hPa (0.05 inHg) Pressing A and C at the same time returns to the factory calibration (OFF). 5. Press E to return to the Barometer/Thermometer Mode screen.
To select the temperature, barometric pressure, and altitude units
1. Enter the Timekeeping Mode. 2. Hold down E until the city code starts to flash, which indicates the setting screen. 3. Use D to select the setting screen for the unit you want to change. See step 2 under To set the time and date manually for information about how to scroll through setting screens.
4. Press C to change the unit setting. Each press of C changes the selected unit setting as shown below. Temperature C and F Barometric Pressure hPa and inHg Altitude m and ft 5. After the settings are the way you want, press E to exit the setting screen.

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