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Operation Guide 3053

1

MO0609-EA

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.

Caution!

Your watch is shipped with it Auto Display feature (which continually changes the

contents of the digital display) turned on. Calibration signal reception is disabled while

Auto Display is turned on.

Press any button to turn off Auto Display and return to the Timekeeping Mode.

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 in order to perform operations in

each mode. Further details and technical information

can be found in the “Reference” section.

▲

▲

Countdown Timer Mode

Stopwatch ModeAlarm Mode

Timekeeping Mode

Press C.

▲

World Time Mode

▲

▲

General Guide

•Press C to change from mode to mode.

•In any mode (except when a setting screen is on the display), press B to illuminate

the display.

Radio-controlled Atomic Timekeeping

This watch receives a time calibration signal and updates

its time setting accordingly.

•Supported time calibration signals: Germany

(Mainflingen), England (Rugby), United States (Fort

Collins), Japan.

Current Time Setting

This watch adjusts its time setting automatically in

accordance with a time calibration signal. You can also

perform a manual procedure to set the time and date,

when necessary.

•The first thing you should do after purchasing this watch

is to specify your Home City (the city where you

normally will use the watch). For more information, see

“To specify your Home City”.

PM

indicator

Month – Day

Year

Day of week

Home Time

(Hour : Minutes Seconds)

•When using the watch outside the areas covered by the time signal transmitters, you

will have to adjust the current time setting manually as required. See “Timekeeping”

for more information about manual time settings.

•The U.S. time calibration signal can be picked up by the watch while in North

America. The term “North America” in this manual refers to the area that consists of

Canada, the continental United States, and Mexico.

To specify your Home City

1. In the Timekeeping Mode, hold down A until the city

code starts to flash, which indicates the setting screen.

2. Press D(east) and B(west) to select the city code you

want to use as your Home City.

•Time calibration signal reception is supported when

any one of the city codes shown in the table below is

selected as your Home City.

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City code

German/U.K. Signal Japan Signal U.S. Signal

City

Code

LIS

LON

MAD

PAR

ROM

BER

STO

City

Name

Lisbon

London

Madrid

Paris

Rome

Berlin

Stockholm

City

Code

ATH

MOW

City

Name

Athens

Moscow

City

Code

HNL

ANC

YVR

LAX

YEA

DEN

MEX

City

Name

Honolulu

Anchorage

Vancouver

Los Angeles

Edmonton

Denver

Mexico City

City

Code

YWG

CHI

MIA

YTO

NYC

YHZ

YYT

City

Name

Winnipeg

Chicago

Miami

Toronto

New York

Halifax

St. Johns

City

Code

HKG

BJS

TPE

SEL

TYO

City

Name

Hong Kong

Beijing

Taipei

Seoul

Tokyo

3. Press A to exit the setting screen.

Important!

•Normally, your watch should show the correct time as soon as you select your Home

City code. If it does not, it should adjust automatically after the next auto receive

operation (in the middle of the night). You can also perform manual receive or you

can set the time manually.

•The watch will receive the time calibration signal automatically from the applicable

transmitter (in the middle of the night) and update its settings accordingly. For

information about the relationship between city codes and transmitters, see “Home

City Codes and Transmitters”.

•Under factory default settings, auto receive is turned off for all of the following city

codes: MOW (Moscow), HKG (Hong Kong), BJS (Beijing), HNL (Honolulu), and

ANC (Anchorage). For details about turning on auto receive for these city codes, see

“To turn auto receive on and off”.

•You can disable time signal reception, if you want. See “To turn auto receive on and

off” for more information.

•See the maps under “Reception Ranges” for information about the reception ranges

of the watch.

•If you are in an area that does not use Daylight Saving Time (summer time), turn off

the DST setting.

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 o’clock side facing towards a window.

Make sure there are no metal objects nearby.

12 o’clock

or

•Make sure the watch is facing the right way.

•Proper signal reception can be difficult or even impossible under the conditions listed

below.

•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.

Inside or

among

buildings

Inside a

vehicle

Near

household

appliances,

office

equipment,

or a mobile

phone

Near a

construction

site, airport,

or other

sources of

electrical

noise

Near high-

tension

power lines

Among or

behind

mountains

•The time calibration signal the watch will attempt to pick up depends on its current

Home City code setting as shown below. If you use the watch in Japan or Europe

(each of which has two different transmitter locations), it will try to receive the time

calibration signal from one of the transmitters in your current location. If it cannot

receive the signal, it will then try to receive the time calibration signal from the other

transmitter.

Home City Code

LIS, LON,

MAD, PAR, ROM, BER,

STO, ATH, MOW*

HKG*, BJS*, TPE,

SEL, TYO

HNL*, ANC*, YVR,

LAX, YEA, DEN, MEX,

YWG, CHI, MIA, YTO,

NYC,YHZ, YYT

Frequency

60.0 kHz

77.5 kHz

40.0 kHz

60.0 kHz

60.0 kHz

Transmitter

Rugby (England)

Mainflingen (Germany)

Fukushima (Japan)

Fukuoka/Saga (Japan)

Fort Collins, Colorado

(the United States)

Home City Codes and Transmitters

* The areas covered by the MOW, HKG, BJS, HNL, and ANC city codes are quite

far from the time calibration signal transmitters, and so certain conditions may

cause problems with signal reception.

Operation Guide 3053

2

Reception Ranges

Rugby

Mainflingen

500 kilometers

Fort Collins

600 miles

(1,000 kilometers)

Fukuoka/Saga

500 kilometers Fukushima

500 kilometers

U.K. and German Signals

U.S. Signal

Japan Signal

1,500 kilometers 2,000 miles

(3,000 kilometers)

1,000 kilometers

1,000 kilometers

•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.

Your Home City Auto Receive Start Times

123456

LIS, LON

MAD, PAR, ROM,

BER, STO

Standard Time

Daylight

Saving Time

Standard Time

Daylight

Saving Time

1:00 am

2:00 am

2:00 am

3:00 am

2:00 am

3:00 am

3:00 am

4:00 am

3:00 am

4:00 am

4:00 am

5:00 am

4:00 am

5:00 am

5:00 am

Midnight

next day

5:00 am

Midnight

next day

Midnight

next day

1:00 am

next day

Midnight

next day

1:00 am

next day

1:00 am

next day

2:00 am

next day

ATH

MOW

HKG, BJS, TPE,

SEL, TYO

HNL, ANC, YVR,

LAX, YEA, DEN,

MEX, YWG, CHI,

MIA, YTO, NYC,

YHZ, YYT

Standard Time

Daylight

Saving Time

Standard Time

Daylight

Saving Time

Standard Time

Standard Time

Daylight

Saving Time

3:00 am

4:00 am

4:00 am

5:00 am

Midnight

Midnight

4:00 am

5:00 am

5:00 am

Midnight

next day

1:00 am

1:00 am

5:00 am

Midnight

next day

Midnight

next day

1:00 am

next day

2:00 am

2:00 am

Midnight

next day

1:00 am

next day

1:00 am

next day

2:00 am

next day

3:00 am

3:00 am

1:00 am

next day

2:00 am

next day

2:00 am

next day

3:00 am

next day

4:00 am

4:00 am

2:00 am

next day

3:00 am

next day

3:00 am

next day

4:00 am

next day

5:00 am

5:00 am

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.

•The watch receives the calibration signal for two to seven minutes everyday when

the time in the Timekeeping Mode reaches each of the calibration times. Avoid

performing any button operation within seven minutes before or after any one of the

calibration times. Doing so can interfere with correct calibration.

•Remember that reception of the calibration signal depends on the current time in the

Timekeeping Mode. The receive operation will be performed whenever the display

shows any one of the calibration times, regardless of whether or not the displayed

time actually is the correct time.

About the Receiving Indicator

The receiving indicator shows the strength of the calibration signal being received.

For best reception, be sure to keep the watch in a location where signal strength is

strongest.

Receiving

indicator

•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 watch’s time

setting, the Level 3 receiving indicator will remain on the display in all modes. The

Level 3 receiving indicator will not be displayed if signal reception was unsuccessful

or after you adjust the current time setting manually.

Weak

(Level 0)

Strong

(Level 3)

•The Level 3 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 3 receiving indicator indicates that at least one of the auto calibration

signal receive operations was successful. Note, however, that the Level 3 receiving

indicator is cleared from the display when the first auto receive operation of the day

is performed.

To perform manual receive

1. Place the watch on a stable surface so its top (12

o’clock side) is facing towards a window.

2. In the Timekeeping Mode, hold down D for about two

seconds until RC! appears 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.

•After signal reception is complete, the display of the

watch changes to the Last Signal screen.

Receiving indicator

Note

•To interrupt a receive operation and return to the Timekeeping Mode, press D.

•If the receive operation is unsuccessful, the message ERR appears on the display

for about one or two minutes. After that, the watch returns to the Timekeeping Mode.

•You can also change from the Last Signal or ERR screen to the normal

timekeeping screen by pressing D.

•Calibration signal reception is disabled while a countdown timer operation is in

progress.

To turn auto receive on and off

1. In the Timekeeping Mode, press D to display the Last

Signal screen.

2. Hold down A until the receiving indicator and current

auto receive setting ( or ) start to flash. This is

the setting screen.

•Note that the setting screen will not appear if the

currently selected Home City is one that does not

support time calibration reception.

3. Press D to toggle auto receive on ( ) and off ( ).

On/Off Status

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4. Press A to exit the setting screen.

•For information about city codes that support signal receive, see “To specify your

Home City”.

To display the Last Signal screen

In the Timekeeping Mode, press D to display the Last Signal screen (indicated by

GET). The Last Signal screen shows the date and time of the last successful time

calibration signal reception.

Last Signal Screen

▲

Press D.

▲

Current Time and Date Screen

PM indicator

Month – Day

Day of week Home Time

(Hour : Minutes Seconds)

Receive date

Receive time

Year

Signal Reception Troubleshooting

Check the following points whenever you experience problems with calibration signal

reception.

Problem

Cannot perform

manual receive.

Auto receive is

turned on, but

the Level 3

receiving

indicator does

not appear on

the display.

Time setting is

incorrect

following signal

reception.

Probable Cause

•

The watch is not in the Timekeeping Mode.

•Your current Home City is not one of the

following city codes:

LIS, LON, MAD, PAR , ROM, BER,

STO, ATH, MOW, HKG, BJS, TPE,

SEL, TYO, HNL, ANC, YVR, LAX, YEA,

DEN, MEX, YWG, CHI, MIA, YTO, NYC,

YHZ, or YYT

•The countdown timer is running.

•You changed the time setting manually.

•The watch was not in the Timekeeping

or World Time Mode, or you performed

some button operation during the auto

receive operation.

•Even if receive is successful, the Level

3 receiving indicator disappears every

day when the first auto receive

operation of the day is performed.

•Time data (hour, minutes, seconds) only

was received during the last receive

operation. The Level 3 receiving

indicator appears only when time data

and date data (year, month, day) are

both received.

•If the time is one hour off, the DST

setting may be incorrect.

•The Home City code setting is not

correct for the area where you are using

the watch.

What you should do

•Enter the Timekeeping Mode

and try again.

•Select LIS, LON, MAD, PAR,

ROM, BER, STO, AT H, MOW,

HKG, BJS, TPE, SEL, TYO,

HNL, ANC, YVR, LAX, YEA,

DEN, MEX, YWG, CHI, MIA,

YTO, NYC, YHZ, or YYT as

your Home City.

•Stop the countdown timer and

try again.

•Perform manual signal receive

or wait until the next auto

signal receive operation is

performed.

•Check to make sure the

watch is in a location where it

can receive the signal.

•Change the DST setting to

Auto DST.

•Select the correct Home City

code.

•For further information, see “Important!” under “Time Calibration Signal Reception”

and “Radio-controlled Atomic Timekeeping Precautions”.

World Time

The World Time Mode shows you the current time in 48

cities (29 time zones) around the world.

•If the current time shown for a city is wrong, check your

Home City time settings and make the necessary

changes.

•All of the operations in this section are performed in the

World Time Mode, which you enter by pressing C.

City code

Timekeeping

Mode time

Current time in selected city

UTC

differential

To view the time in another city

While in the World Time Mode, press D to scroll eastward through the city codes

(time zones).

•For full information on city codes, see the “City Code Table”.

Operation Guide 3053

3

To toggle a city code time between Standard Time and Daylight Saving Time

1. In the World Time Mode, use D to display the city code

(time zone) whose Standard Time/Daylight Saving Time

setting you want to change.

2. Hold down A to toggle Daylight Saving Time (DST

indicator displayed) and Standard Time (DST indicator

not displayed).

•The DST indicator will appear whenever you display a

city code for which Daylight Saving Time is turned on.

•Note that the DST/Standard Time setting affects only the

currently displayed city code. Other city codes are not

affected.

DST indicator

Countdown Timer

You can set the countdown timer within a range of one to

60 minutes. An alarm sounds when the countdown

reaches zero.

•All of the operations in this section are performed in the

Countdown Timer Mode, which you enter by pressing

C.

Timekeeping Mode time

(Hour : Minutes Seconds)

Minutes Seconds

To set the countdown start time

1. While the countdown start time is on the display in the Countdown Timer Mode,

hold down A until the current 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. While a setting is flashing, use D (+) and B (–) to change it.

3. Press A to exit the setting screen.

To use the countdown timer

Press D while in the Countdown Timer Mode to start the countdown timer.

•When the end of the countdown is reached, the alarm sounds for 10 seconds or until

you stop it by pressing any button. The countdown time is reset automatically to its

starting value after the alarm stops.

•Press D while a countdown operation is in progress to pause it. Press D again to

resume the countdown.

•To stop a countdown operation completely, first pause it (by pressing D), and then

press A. This returns the countdown time to its starting value.

•Calibration signal reception is disabled while a countdown timer operation is in

progress.

Stopwatch

The stopwatch lets you measure elapsed time, split times,

and two finishes.

•The display range of the stopwatch is 59 minutes, 59.99

seconds.

•The stopwatch continues to run, restarting from zero

after it reaches its limit, until you stop it.

•Exiting the Stopwatch Mode while a split time is frozen

on the display clears the split time and returns to

elapsed time measurement.

•The stopwatch measurement operation continues even

if you exit the Stopwatch Mode.

•All of the operations in this section are performed in the

Stopwatch Mode, which you enter by pressing C.

1/100

seconds

Timekeeping Mode time

(Hour : Minutes Seconds)

Minutes Seconds

To measure times with the stopwatch

D

Start Stop

Elapsed Time

➤

Re-start Clear

D➤

Stop

D➤D➤A

Split Time

D

Start Split

(SPL displayed)

➤

Split release Clear

A➤

Stop

A➤D➤A

Two Finishes

D

Start Split

➤

Stop Clear

A➤

Split release

D➤A➤A

First runner

finishes.

Display time of

first runner.

Second runner

finishes.

Display time of

second runner.

Alarm

After you set (and turn on) the daily alarm, the alarm tone

sounds when the alarm time is reached. You can also turn

on an Hourly Time Signal that causes the watch to beep

for about one second every hour on the hour.

•All of the operations in this section are performed in the

Alarm Mode, which you enter by pressing C.

Timekeeping Mode time

(Hour : Minutes Seconds)

Alarm time

(Hour : Minutes)

Hourly time

signal on

indicator

Alarm on

indicator

To set the alarm time

1. In the Alarm Mode, hold down A until the hour setting

of the alarm time starts to flash, which indicates the

setting screen.

•This automatically turns on the alarm.

2. Press C to move the flashing between the hour and

minute settings.

3. While a setting is flashing, use D (+) and B (–) to change it.

•When setting the alarm time using the 12-hour format, take care to set the time

correctly as a.m. (A indicator) or p.m. (P indicator).

4. Press A to exit the setting screen.

Alarm Operation

The alarm sounds at the preset time for about 10 seconds (in all modes), or until you

stop it by pressing any button.

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To test the alarm

In the Alarm Mode, hold down D to sound the alarm.

To turn the daily alarm and the Hourly Time Signal on and off

In the Alarm Mode, press D to cycle through the settings shown below.

•The alarm on indicator and the Hourly Time Signal on indicator are shown on the

display in all modes while these functions are turned on.

Alarm On Indicator / Hourly Time Signal On Indicator

Alarm Off

Signal Off

Alarm On

Signal Off

Alarm Off

Signal On

Alarm On

Signal On

Timekeeping

Use the Timekeeping Mode to set and view the current time and date.

•When setting the time, you can also configure settings for the City Code, the DST

setting, the 12/24-Hour Format, Year, Month, Day, the Language setting, and the

Month/Day display format, and you can specify the screens that are displayed in the

Timekeeping Mode.

•Pressing D in the Timekeeping Mode will display the Last Signal screen.

▲

Press D.

▲

Last Signal ScreenCurrent Time and Date Screen

Note

This watch is capable of displaying text for the day of the week in any one of 9

different languages (English, Spanish, French, Portuguese, German, Italian, Chinese,

Russian, and Japanese).

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Setting the Time and Date

Make sure you select your Home City code before you change the current time and

date settings. World Time Mode times are all displayed in accordance with the

Timekeeping Mode settings. Because of this, World Time Mode times will not be

correct if you do not select the proper Home City code before setting the time and

date in the Timekeeping Mode.

To set the time and date

1. In the Timekeeping Mode, hold down A until the city

code starts to flash, which indicates the setting screen.

2. Press C to change the flashing contents in the

sequence shown below to select other settings.

City code

3. When the setting you want to change is flashing, use B and/or D to change it as

described below.

Seconds Hour Minutes

12/24-Hour

Format

Month Year

DST

Day

Language

City Code

Month/Day Display Format

Screen: To do this:

Change the city code

Cycle between auto DST ( ), Standard Time

(), and Daylight Saving Time ( )

Toggle between 12-hour (12H) and 24-hour

(24H) timekeeping

Do this:

Use D (east) and

B (west).

Press D.

Press D.

Reset the seconds to

Change the hour, minutes, or year

Change the month or day

Change the language

ENG: English ESP: Spanish FRA: French

POR: Portuguese DEU: German

ITA: Italian CHN: Chinese RUS: Russian

JPN: Japanese

Toggle the month/day display format between

month/day (M/D) and day/month (D/M).

Press D.

Use D (+) and B

(–).

Use D and B.

Press D.

Operation Guide 3053

4

•See “City Code Table” for a complete list of available city codes.

•See the “Day of the Week List” for information on abbreviations used.

•Auto DST ( ) can be selected only while LIS, LON, MAD, PAR, ROM, BER,

STO, ATH, MOW, HKG, BJS, TPE, SEL, TYO, HNL, ANC, YVR, LAX, YEA, DEN,

MEX, YWG, CHI, MIA, YTO, NYC, YHZ, or YYT is selected as the Home City code.

For more information, see “Daylight Saving Time (DST)” below.

4. Press A to exit the setting screen.

Daylight Saving Time (DST)

Daylight Saving Time (summer time) advances the time setting by one hour from

Standard Time. Remember that not all countries or even local areas use Daylight

Saving Time.

The time calibration signals transmitted from Mainflingen (Germany), Rugby

(England), or Fort Collins (the United States) includes both Standard Time and DST

data. When the Auto DST setting is turned on, the watch switches between Standard

Time and DST (summer time) automatically in accordance with the received time

signal.

•The time calibration signals transmitted from Fukushima and Fukuoka/Saga (Japan)

do not include summer time data.

•The default DST setting is Auto DST ( ) whenever you select LIS, LON, MAD,

PAR , ROM, BER, STO, AT H , MOW, TYO, ANC, YVR, LAX, YEA, DEN, MEX, YWG,

CHI, MIA, YTO, NYC, YHZ, or YYT as your Home City code.

•If you experience problems receiving the time calibration signal in your area, it

probably is best to switch between Standard Time and Daylight Saving Time

(summer time) manually.

To change the Daylight Saving Time (summer time) setting

1. In the Timekeeping Mode, hold down A until the city code starts to flash, which

indicates the setting screen.

2. Press C and the DST setting screen appears.

3. Use D to cycle through the DST settings in the sequence shown below.

Auto DST ( ) DST off ( ) DST on ( )

4. When the setting you want is selected, press A to exit the setting screen.

•The DST indicator appears to indicate that Daylight Saving Time is turned on.

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.

Auto Display

Auto Display continually changes the contents of the digital display.

To turn off Auto Display

Press any button to turn off Auto Display. This returns to the Timekeeping Mode.

To turn on Auto Display

In the Timekeeping Mode, while holding down B, hold down D for about two

seconds until the watch beeps.

Note

•Calibration signal reception is disabled while Auto Display is being performed.

•Auto Display cannot be performed while a setting screen is on the display.

Button Operation Tone

The button operation tone sounds any time you press one

of the watch’s buttons. You can turn the button operation

tone on or off as desired.

•Even if you turn off the button operation tone, the alarm,

Hourly Time Signal, and Countdown Timer Mode alarm

all operate normally.

To turn the button operation tone on and off

In any mode (except when a setting screen is on the

display), hold down C to toggle the button operation tone

on ( not displayed) and off ( displayed).

•Since the C button is also the mode change button, holding it down to turn the

button operation tone on or off also causes the watch’s current mode to change.

• is displayed in all modes when the button operation tone is turned off.

Mute indicator

Auto Return Features

•If you leave the watch with the Last Signal screen in the Timekeeping Mode for one

or two minutes without performing any operation, it returns to the Current Time and

Date screen in the Timekeeping Mode automatically.

•If you leave the watch in the Alarm Mode for two or three minutes without performing

any operation, it returns to the Timekeeping Mode automatically.

•If you leave the watch with a flashing setting on the display for two or three minutes

without performing any operation, the watch exits the setting screen automatically.

Scrolling

B and D are used in various modes and setting screens to scroll through data. In

most cases, holding down these buttons during a scroll operation scrolls through the

data at high speed.

Initial Screens

When you enter the World Time or Alarm Mode, the data you were viewing when you

last exited the mode appears first.

Radio-controlled Atomic Timekeeping Precautions

•The display of the watch is blank while an auto receive operation is in progress.

•Strong electrostatic charge can result in the wrong time being set.

•The time calibration signal is bounced 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.

•The watch is designed to update the date and day of the week automatically for the

period January 1, 2000 to December 31, 2099. Setting of the date by a 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.

•Normally, the signal reception date shown by the Last Signal screen is the date data

included in the received time calibration signal. When only time data is received,

however, the Last Signal screen shows the date as kept in the Timekeeping Mode at

the time of signal reception.

•If you are in an area where proper time calibration signal reception is impossible, the

watch keeps time within ±20 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 watch’s Home City code setting will change automatically to TYO (Tokyo)

whenever the battery goes dead or is replaced. TYO (Tokyo) causes the watch to

receive the time calibration signals of Japan. If you are using the watch in North

America or Europe, you will need to change the Home City code setting to match

your location after having the watch’s battery replaced.

Timekeeping

•Resetting the seconds to 00 while the current count is in the range of 30 to 59

causes the minutes to be increased by 1. In the range of 00 to 29, the seconds are

reset to 00 without changing the minutes.

•The day of the week is displayed automatically in accordance with the date (year,

month, and day) settings.

•The year can be set in the range of 2000 to 2099.

•The watch’s 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 after you have the watch’s battery replaced.

•The times for the Timekeeping Mode and all the city codes of the World Time Mode

are calculated in accordance with each city’s UTC differential.

•The UTC differential is a value that indicates the time difference between a

reference point in Greenwich, England and the time zone where a city is located.

• The letters “UTC” is the abbreviation for “Universal Time Coordinated”, which is the

world-wide scientific standard of timekeeping. It is based upon carefully maintained

atomic (cesium) clocks that keep time accurately to within microseconds. Leap

seconds are added or subtracted as necessary to keep UTC in sync with the Earth’s

rotation.

12-hour/24-hour Timekeeping Formats

The 12-hour/24-hour timekeeping format you select in the Timekeeping Mode is also

applied in all other modes.

•With the 12-hour format, the PM indicator (P) appears on the display for times in the

range of noon to 11:59 p.m. and AM indicator (A) appears for times in the range of

midnight to 11:59 a.m.

•With the 24-hour format, times are displayed in the range of 0:00 to 23:59, without

any indicator.

Illumination

This watch has an EL (electro-luminescent) panel that causes the entire display to

glow for easy reading in the dark. In any mode (except when a setting screen is on the

display), press B to illuminate the display for about three seconds.

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.

• 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.

• Illumination automatically turns off whenever an alarm sounds.

• Frequent use of illumination runs down the battery.

Day of the Week List

Sunday Monday Tuesday

Wednesday

Thursday

Friday Saturday

ENx SUN oON TUE WED THU FRI SAT

ESP DOo LUN oAR oIb JUE VIE SaB

FRA DIo LUN oAR oER JEU VEN SAo

POR DOo SEx TER QUA QUI SEX SaB

DEU SON oON DIE oIT DON FRE SAo

ITA DOo LUN oAR oER xIO VEN SAB

CHN

RUS CS QO BTSR YT QT SB

JPN

Operation Guide 3053

5

Pago Pago

Honolulu

Anchorage

Vancouver

Los Angeles

Edmonton

Denver

Mexico City

Winnipeg

Chicago

Miami

Toronto

New York

Caracas

Halifax

St. Johns

Rio De Janeiro

Praia

City City UTC Other major cities in same time zone

Code

Differential

City Code Table

PPG

HNL

ANC

YVR

LAX

YEA

DEN

MEX

YWG

CHI

MIA

YTO

NYC

CCS

YHZ

YYT

RIO

RAI

–11.0

–10.0

–09.0

–08.0

–07.0

–06.0

–05.0

–04.0

–03.5

–03.0

–01.0

Papeete

Nome

San Francisco, Las Vegas,

Seattle/Tacoma, Dawson City

El Paso

Houston, Dallas/Fort Worth, New Orleans

Montreal, Detroit, Boston,

Panama City, Havana, Lima, Bogota

La Paz, Santiago, Port Of Spain

Sao Paulo, Buenos Aires, Brasilia, Montevideo

Lisbon

London

Madrid

Paris

Rome

Berlin

Stockholm

Athens

Cairo

Jerusalem

Moscow

Jeddah

Tehran

Dubai

Kabul

Karachi

Delhi

+00.0

+01.0

+02.0

+03.0

+03.5

+04.0

+04.5

+05.0

+05.5

Dublin, Casablanca, Dakar, Abidjan

Milan, Amsterdam, Algiers, Hamburg, Frankfurt, Vienna

Helsinki, Istanbul, Beirut, Damascus,

Cape Town

Kuwait, Riyadh, Aden, Addis Ababa, Nairobi

Shiraz

Abu Dhabi, Muscat

Male

Mumbai, Kolkata, Colombo

LIS

LON

MAD

PAR

ROM

BER

STO

AT H

CAI

JRS

MOW

JED

THR

DXB

KBL

KHI

DEL

Dhaka

Yangon

Bangkok

Hong Kong

Beijing

Taipei

Seoul

Tokyo

Adelaide

Guam

Sydney

Noumea

Wellington

+06.0

+06.5

+07.0

+08.0

+09.0

+09.5

+10.0

+11.0

+12.0

Jakarta, Phnom Penh, Hanoi, Vientiane

Singapore, Kuala Lumpur, Manila, Perth, Ulaanbaatar

Pyongyang

Darwin

Melbourne, Rabaul

Port Vila

Christchurch, Nadi, Nauru Island

DAC

RGN

BKK

HKG

BJS

TPE

SEL

TYO

ADL

GUM

SYD

NOU

WLG

•Based on data as of June 2006.