MO0412-EA

Operation Guide 2894

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 and keep it on hand for later reference when necessary. 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 5 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.

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.
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.
Keep the watch exposed to bright light

Bright light

l l l l l l l l l

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. Even if the face of the watch is only partially blocked from light, charging will be reduced significantly.
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.
Battery charges in the light.
Solar cell (Converts light to electrical power.)

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.
Battery discharges in the dark.
Electrical energy All functions enabled

LEVEL 1 LEVEL 2 LEVEL 3

LEVEL 1 LEVEL 2 Some functions disabled

(Light)

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.

General Guide

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

Press D.

Timekeeping Mode
You can use buttons A, B, and C to directly enter a sensor mode from the Timekeeping Mode or from another sensor mode. To enter a sensor mode from the Data Recall, World Time, Stopwatch, Countdown Timer, or Alarm 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

Timekeeping

Month Day Day of week

Press E.

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.
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 correctly set your Home City time and date, you can set the watch up for timekeeping with a different city code simply by changing the Home City code in the Timekeeping Mode.
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 set the time and date

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.

PM indicator

Seconds

Hour : Minutes

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
To take a direction reading
Magnetic north pointer 12 oclock position Direction indicator

Altitude Unit

Temperature Unit
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 Toggle between Daylight Saving Time (ON) and Standard Time (OFF). Do this: Use C (east) and A(west). Press C.

Angle value (in degrees)

W SW WSW

W NW NNW WN

NN E NE ENE
1. While the watch is in the Digital Compass Mode, place it on a flat surface or, if you are wearing the watch, make sure that your wrist is horizontal (in relation to the horizon). 2. Point the 12 oclock position of the watch in the direction you want to measure. 3. Press A to start a Digital Compass measurement operation. After about two seconds, the direction that the 12 oclock position of the watch is pointing appears on the display. Also, four pointers appear to indicate magnetic north, south, east, and west. After the first reading is obtained, the watch continues to take direction readings automatically each second, for up to 20 seconds.

lll llll

In some areas, barometric pressure is expressed in millibars (mb) instead of hectopascals (hPa). It really makes no difference, because 1hPa = 1mb. You can select either hectopascals (hPa) or inchesHg (inHg) as the display unit for the measured barometric pressure, and Celsius (C) or Fahrenheit (F) as the display unit for the measured temperature value. See To select the temperature, barometric pressure, and altitude units. See Barometer and Thermometer Precautions for important precautions. 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.
About Barometric and Temperature Measurements
Barometric Pressure Graph
Barometric pressure indicates changes in the atmosphere. By monitoring these changes you can predict the weather with reasonable accuracy. This watch takes barometric pressure measurements automatically every two hours (at the top of each even-numbered hour), regardless of its current mode. Measurement results are used to produce barometric pressure graph and barometric pressure differential pointer readings. The barometric pressure graph shows readings of previous measurements for up to 30 hours. The horizontal axis of the graph represents time, with each dot standing for two hours. The rightmost dot (flashing) represents the most recent reading. The vertical axis of the graph represents barometric pressure, with each dot standing for the relative difference between its reading and that of the dots next to it. Each dot represents 1hPa. 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. Not visible on The following conditions cause the barometric pressure measurement to be skipped, with the corresponding point on the display. 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

Current pressure greater than most recent measured pressure
How the Altimeter Measures Altitude
The altimeter can measure altitude based on its own preset values, or a reference altitude specified by you. When you measure altitude based on preset values Data produced by the watch's barometric pressure sensor is converted to approximate altitude based on ISA (International Standard Atmosphere) conversion values stored in watch memory. When you measure altitude using a reference altitude specified by you After you specify a reference altitude, the watch uses that value to convert the current measured barometric pressure value to altitude. To determine the height of a tall building, for example, specify zero for the reference altitude value while you are on the ground floor. Then when you go to a higher floor, the altitude displayed by the watch will indicate the height from the ground floor. Note that you may not be able to get a good reading if the building is pressurized or air-conditioned. When mountain climbing, you can set the B reference value in accordance with a marker along the way or altitude information from a A map. After that, the altitude readings 400 produced by the watch will be more accurate than they would without a reference altitude.
inHg values Barometric pressure differential pointer hPa values
Points to 9 o'clock for differentials outside the range of 15 hPa/ 0.44 inHg.
Pressure differential examples in the illustration are indicated in 10 hPa/0.3 inHg steps.
Current pressure less than most recent measured pressure
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 regularly update the displayed altitude value, 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.
To turn display of the barometric pressure differential pointer on and off

Current Session Record

The Current Session Record contains the data descr ibed belo w. The contents of this record are updated at regular inter vals while a sa ve session is in progress. Data High Altitude Low Altitude Total Ascent Total Descent Description Highest altitude reached during the current session. Lowest altitude reached during the current session. Total cumulative ascent during the current session. Total cumulative descent during the current session.
Specifying a Reference Altitude
After you specify a ref erence altitude , the w atch adjusts its air-pressure-toaltitude con version calculation accordingly. The altitude measurements produced b y this watch are subject to error caused b y changes in air pressure. Because of this , we recommend that y ou update the ref erence altitude whene ver one is a vailable during your climb.
Relative Altitude Relative change in altitude during the current session. Change

Historical Record

The Historical Record keeps tr ack of high altitude , low altitude , total ascent, and total descent v alues across m ultiple sa ve sessions. The contents of this record are updated at the end of each session. Data High Altitude Low Altitude Total Ascent Total Descent Description Highest altitude reached during all of the sessions. Lowest altitude reached during all of the sessions. Total cumulative ascent during all of the sessions. Total cumulative descent during all of the sessions.
Note that the histor ical record does not k eep tr ack of relativ e altitude change. See Clearing the Histor ical Record for information about clear ing the historical record, which restar ts all data v alues from z ero. How the historical record is updated The watch perf orms the f ollowing oper ations when a sa ve session is stopped (after per iodic records 40 records are stored or when y ou holding do wn C). Data High Altitude Low Altitude Total Ascent Total Descent Update Operation The historical record value is compared with the current session value, and the greater of the two is recorded in the historical record. The historical record value is compared with the current session value, and the lesser of the two is recorded in the historical record. The current session value is added to the historical record value.
To start a new save session
1. Press C to enter the Altimeter Mode. 2. Hold do wn C for about one second until REC flashes on the displa y, which indicates that a new session is in prog ress. During a sa ve session, y ou can press E to toggle betw een the current altitude screen and the relativ e altitude change screen.
Relative Altitude Change Screen

Current Altitude Screen

Session relative altitude change
Relative altitude indicator
To set a reference altitude

Foot values Meter values

Altitude differential pointer

Data Screens

The following explains the contents of each of the screens that appear in the Data Recall Mode. Note While the periodic record, high altitude, or low altitude screen is displayed, the bottom part of the display alternates between the measurement date (month and day) and measurement time at 1-second intervals.
Periodic record indicator Altitude
Alternates at 1-second intervals.
Points to 9 o'clock for differentials outside the range of 15 meters/49 feet.
Altitude differential examples in the illustration are indicated in 10-meter/33-foot steps.
Current altitude less than most recent measured altitude
Recording time (Hour : Minutes)
Altitude differential is indicated in the range of 15 meters, in 1-meter units. Altitude is calculated and displayed using meters as the standard. Altitude can also be read in feet units as shown in the illustration.
Periodic records show only data for the last save session performed with the watch. There can be up to 40 periodic records in memory.
To turn display of the altitude differential pointer on and off
1. In the Altimeter 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 altitude value (if set) start 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 altitude 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.
Current Session Record Contents
The following data items show the contents of the current session record. Data Type High Altitude Low Altitude Total Ascent Total Descent Relative Altitude Change Screen Name

MAX MIN ASC DSC REL

Altitude Alarm
The altitude alarm sounds for about five seconds when the current altitude matches a preset value during an altitude measurement operation. You can press any button to stop the alarm after it starts to sound. The altitude alarm sounds only while the Altimeter Modes Altitude Screen is on the display. It does not sound while the watch is in another mode or while another Altimeter Mode screen is on the display. Example If you set the altitude alarm at 130 meters, it sounds when you pass the 130meter mark on your way up and on your way back down.
The horizontal axis represents time, and the flashing dot in the rightmost column indicates the latest measurement result. For the first three minutes, each dot represents five seconds. After that, each dot represents two minutes. An out of range measurement result or a measurement error will cause the column of dots for that measurement to be blank (skipped).

C Re-start

C Stop

A Clear

A Split release
C Stop Second runner finishes.
A Split release Display time of second runner.

Countdown Timer

Minutes Seconds

Alarms

You can set a countdown timer start time in the range of one minute to 60 minutes. An alarm sounds when the countdown reaches zero. An auto-repeat feature causes the countdown to restart automatically when the end of a countdown is reached, and a progress beeper signals the progress of the countdown. All of the operations in this section are performed in the Countdown Timer Mode, which you enter by pressing D.
Alarm on indicator Hourly time signal on indicator Alarm number
Configuring the Countdown Timer
The following are the settings you should configure before actually using the countdown timer. Countdown start time Auto-repeat on/off Progress beeper on/off
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.

Countdown start time

You can set a countdown start time in the range of one minute to 60 minutes, in one-minute increments.

To set an alarm time

1. In the Alarm Mode, use C and A to scroll through the alarm screens until the one whose time you want to set is displayed.

AL1 AL2 AL3

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.

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).

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 automatically turns on illumination 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.
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 while the Digital Compass, Barometer/ Thermometer, or Altimeter Mode setting screen is on the display.
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. 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.

Parallel to ground

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.

Altitude Air Pressure

616 hPa 3500 m 3000 m 2500 m 2000 m 1500 m 1000 m 0m 500 m 701 hPa 795 hPa 899 hPa 1013 hPa About 8 hPa per 100 m About 9 hPa per 100 m About 10 hPa per 100 m About 11 hPa per 100 m About 12 hPa per 100 m

More than 40

Temperature
11C 4.5C 2C 8.5C 15C About 6.5C per 1000 m
Warning! Always make sure you are in a safe place whenever you are reading the display of the watch using the auto light switch. Be especially careful when running or engaged in any other activity that can result in accident or injury. Also take care that sudden illumination by the auto light switch does not startle or distract others around you. When you are wearing the watch, make sure that its auto light switch is turned off before riding on a bicycle or operating a motorcycle or any other motor vehicle. Sudden and unintended operation of the auto light switch can create a distraction, which can result in a traffic accident and serious personal injury.

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.

Power Supply

This watch is equipped with a solar cell and a special rechargeable battery (secondary battery) that is charged by the electrical power produced by the solar cell. The illustration shown below shows how you should position the watch for charging. Example: Orient the watch so its face is pointing at a light source. The illustration shows how to position a watch with a resin band. Note that charging efficiency drops when any part of the solar cell is blocked by clothing, etc. You should try to keep the watch outside of your sleeve as much as possible. Even if the face of the watch is only partially blocked from light, charging will be significantly reduced.

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

Charging Guide

After a full charge, timekeeping remains enabled for up to about six 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 21 minutes 42 minutes 7 hours

Important!

Storing the watch for long periods in an area where there is no light or wearing it in such a way that it is blocked from exposure to light can cause rechargeable battery power to run down. Be sure that the watch is normally exposed to bright light whenever possible. This watch uses a special rechargeable battery to store power produced by the solar cell, so regular battery replacement is not required. However, after very long use, the rechargeable battery may lose its ability to achieve a full charge. If you experience problems getting the special rechargeable battery to fully charge, contact your dealer or CASIO distributor about having it replaced. Never try to remove or replace the watchs special battery yourself. Use of the wrong type of battery can damage the watch. All data stored in memory is deleted, and the current time and all other settings return to their initial factory defaults whenever battery power drops to Level 5 and when you have the battery replaced. Turn on the watchs Power Saving function and keep it in an area normally exposed to bright light when storing it for long periods. This helps to keep the rechargeable battery from going dead.
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
Since these are the specs, we can include all the technical details. Watch not exposed to light Internal timekeeping Display on 18 hours per day, sleep state 6 hours per day 1 illumination operation (1.5 seconds) per day 10 seconds of alarm operation per day 10 digital compass operations per week 10 hours of altimeter measurements, once per month Stable operation is promoted by frequent charging. Recovery Times The table below shows the amount exposure that is required to take the battery from one level to the next. Approximate Exposure Time Exposure Level (Brightness) Level 5 Level 4 Level 3 Level 2 Level 1

Battery Power Indicator

Function Status All functions enabled. All functions enabled. Illumination, beeper, and sensor operation disabled.

l l l l l lll l

Outdoor Sunlight (50,000 lux) Sunlight Through a Window (10,000 lux)

Scrolling

The A and C buttons are used on the setting screen to scroll through data on the display. In most cases, holding down these buttons during a scroll operation scrolls through the data at high speed.
Sensor Malfunction Indicator
Subjecting the watch to strong impact can cause sensor malfunction or improper contact of internal circuitry. When this happens, ERR (error) will appear on the display and sensor operations will be disabled.
Digital Compass Measurement Barometric Pressure Measurement Altitude Measurement
The 12-hour/24-hour timekeeping format you select in the Timekeeping Mode is applied in all modes. The watchs built-in full automatic calendar makes allowances for different month lengths and leap years. Once you set the date, there should be no reason to change it except when battery power drops to Level 4. The current time for all city codes in the Timekeeping Mode and World Time Mode is calculated in accordance with the Greenwich Mean Time (GMT) differential for each city, based on your Home City time setting. GMT differential is calculated by this watch based on Universal Time Coordinated (UTC) data.

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 automatically turns off 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.
If ERR appears while a measurement operation is being performed in a sensor mode, restart the measurement. If ERR appears on the display again, it can mean there is something wrong with the sensor. 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. In this case, ERR will appear on the display. This does not indicate malfunction, and sensor operation should resume once battery voltage returns to its normal level. If ERR keeps appearing during measurement, it could mean there is a problem with the applicable sensor. Whenever you have a sensor malfunction, be sure to take the watch to your original dealer or nearest authorized CASIO distributor as soon as possible.

Auto light switch precautions
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.
More than 15 degrees too high

Power Saving

When turned on, Power Saving automatically enters a sleep state whenever the watch is left for a certain period in an area where it is dark. The table below shows how watch functions are affected by Power Saving. There are actually two sleep state levels: display sleep and function sleep.
Illumination may not turn on if the face of the watch is more than 15 degrees above or below parallel. Make sure that the back of your hand is parallel to the ground. Illumination turns off after the preset illumination duration (see To specify the illumination duration), even if you keep the watch pointed towards your face.
Elapsed Time in Dark 60 to 70 minutes (Display Sleep) 6 or 7 days (Function Sleep)
Display Blank, with PS flashing Blank, with PS not flashing
Operation Display is off, but all functions are enabled. All functions are disabled, but timekeeping is maintained.
Wearing the watch inside the sleeve of clothing can cause it to enter the sleep state. The watch will not enter the sleep state while the digital time is between 6:00 AM and 9:59 PM. If the watch is already in the sleep state when the digital time reaches 6:00 AM, however, it will remain in the sleep state. The watch will not enter the sleep state while it is in the Countdown Timer or Stopwatch Mode.
Static electricity or magnetic force can interfere with proper operation of the auto light switch. If illumination does not turn on, try moving the watch back to the starting position (parallel with the ground) and then tilt it back towards your face again. If this does not work, drop your arm all the way down so it hangs at your side, and then bring it back up again. Under certain conditions, illumination does not turn on until about one second after you turn the face of the watch towards you. This does not necessarily indicate malfunction. You may notice a very faint clicking sound coming from the watch when it is shaken back and forth. This sound is caused by mechanical operation of the auto light switch, and does not indicate a problem with the watch.

Digital Compass Precautions
This watch features a built-in magnetic bearing sensor that detects terrestrial magnetism. This means that north indicated by this watch is magnetic north, which is somewhat different from true polar north. The magnetic north pole is located in northern Canada, while the magnetic south pole is in southern Australia. Note that the difference between magnetic north and true north as measured with all magnetic compasses tends to be greater as one gets closer to either of the magnetic poles. You should also remember that some maps indicate true north (instead of magnetic north), and so you should make allowances when using such maps with this watch. Location Taking a direction reading when you are near a source of strong magnetism can cause large errors in readings. Because of this, you should avoid taking direction readings while in the vicinity of the following types of objects: permanent magnets (magnetic necklaces, etc.), concentrations of metal (metal doors, lockers, etc.), high tension wires, aerial wires, household appliances (TVs, personal computers, washing machines, freezers, etc.) Accurate direction readings are impossible while in a train, boat, air plane, etc. Accurate readings are also impossible indoors, especially inside ferroconcrete structures. This is because the metal framework of such structures picks up magnetism from appliances, etc. Storage The precision of the bearing sensor may deteriorate if the watch becomes magnetized. Because of this, you should be sure to store the watch away from magnets or any other sources of strong magnetism, including: permanent magnets (magnetic necklaces, etc.) and household appliances (TVs, personal computers, washing machines, freezers, etc.) Whenever you suspect that the watch may have become magnetized, perform one of the calibration procedures under Calibrating the Bearing Sensor.
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 readings.
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.