Casio 3451 User manual

Operation Guide 3451
E-9
Stopwatch ModeWorld Time Mode
Countdown Timer ModeAlarm Mode
E-8
General Guide
•The illustration below shows which buttons you need to press to navigate between
modes.
•In any mode (except when a setting screen is on the display), press Bto illuminate
the display.
•You can enter the Digital Compass/Thermometer Mode from the Timekeeping Mode
by pressing D. To enter from another mode, first use Cto enter the Timekeeping
Mode, and then press D.
Press C.
Timekeeping Mode
Digital Compass/
Thermometer Mode
Press D.Press C.
E-7
To do this: Enter this mode: See:
Use the countdown timer Countdown Timer
Mode E-52
Set an alarm time Alarm Mode E-55
* Coordinated Universal Time (UTC) is the global time standard used to regulate time.
E-6
Mode Reference Guide
Your watch has 6 “modes”. The mode you should select depends on what you want to do.
To do this: Enter this mode: See:
•View the current time and date in your Home City and the
current time in the Local Time City
•Configure the Daylight Saving Time (DST) settings of your
Home City and Local Time City
•Configure the time and date settings of your Home City
and the time setting of the Local Time City
Timekeeping Mode E-10
•Determine north and the bearing to a destination
•Determine the temperature at your current location
Digital Compass/
Thermometer Mode E-23
•View the current time in one of 48 cities (31 time zones)
and UTC* time
•Simultaneously view the current time in your World Time
City, Home City, and Local Time City.
World Time Mode E-47
Use the stopwatch to measure elapsed time Stopwatch Mode E-50
E-5
Alarms……………………………………………………………………………………E-55
To set an alarm time ……………………………………………………………E-56
To test the alarm ………………………………………………………………E-57
To turn an alarm and the hourly time signal on and off ……………………E-58
Illumination ……………………………………………………………………………E-59
To turn on illumination …………………………………………………………E-60
To change the illumination duration …………………………………………E-60
Reference ………………………………………………………………………………E-62
To turn the button operation tone on and off…………………………………E-63
Specifications …………………………………………………………………………E-67
E-4
To perform magnetic declination correction …………………………………E-37
To take a temperature reading ………………………………………………E-42
To calibrate the temperature sensor …………………………………………E-45
To specify the temperature display unit ………………………………………E-46
World Time………………………………………………………………………………E-47
To view the time in another city ………………………………………………E-48
To toggle a city code time between Standard Time and
Daylight Saving Time ………………………………………………………E-48
To swap your World Time City and Local Time City ………………………E-49
Stopwatch ………………………………………………………………………………E-50
To measure times with the stopwatch ………………………………………E-51
Countdown Timer………………………………………………………………………E-52
To configure countdown start time and auto-repeat settings ………………E-53
To use the countdown timer……………………………………………………E-54
E-3
Contents
Mode Reference Guide ……………………………………………………………… E-6
General Guide ………………………………………………………………………… E-8
Timekeeping ……………………………………………………………………………E-10
To set your Home City time and date…………………………………………E-12
To toggle the Timekeeping Mode time between DST and
Standard Time ………………………………………………………………E-16
To specify the Local Time City…………………………………………………E-18
To toggle a Local Time City time between Standard Time and
Daylight Saving Time ………………………………………………………E-19
To swap your Home City and Local Time City ………………………………E-20
Digital Compass/Thermometer ……………………………………………………E-23
To enter and exit the Digital Compass/Thermometer Mode ………………E-24
To take a direction reading ……………………………………………………E-27
To calibrate the bearing sensor ………………………………………………E-35
E-2
About This Manual
•Depending on the model of your watch, display text
appears either as dark figures on a light background or
light figures on a dark background. All sample displays
in this manual are shown using dark figures on a light
background.
•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.
(Light)
(Light)
E-1
ENGLISH
Warning!
•The measurement functions built into this watch are not intended for use in
taking measurements that require professional or industrial precision. Values
produced by this watch should be considered as reasonably accurate
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.
•Note that CASIO COMPUTER CO., LTD. assumes no responsibility for any
damage or loss suffered by you or any third party arising through the use of
your watch or its malfunction.
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.
Applications
The built-in sensors of this watch measure direction and temperature. 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.
E
MO1610-EA © 2016 CASIO COMPUTER CO., LTD.

Operation Guide 3451
E-19
To toggle a Local Time City time between Standard Time and Daylight Saving Time
1. In the Timekeeping Mode, hold down Afor about four seconds until the time zone
of the currently selected Local Time City starts to flash on the world map. This is the
setting screen.
•Note that the Home City time zone will flash on the world map about two seconds
after you hold down A. Keep Adepressed for about four seconds until the
Local Time zone flashes.
2. Press Conce to display the DST setting screen.
3. Press Dto toggle between Daylight Saving Time (ON displayed) and Standard
Time (OFF displayed).
•Note that you cannot switch between Standard Time and Daylight Saving Time
(DST) while UTC is selected as your Local Time City.
4. Press Ato exit the setting screen.
•The DST indicator will be in the upper left corner of the display while Daylight
Saving Time is enabled.
E-18
To specify the Local Time City
1. In the Timekeeping Mode, hold down Afor about four
seconds until the time zone of the currently selected
Local Time City starts to flash on the world map. This is
the setting screen.
•Note that the Home City time zone will flash on the
world map about two seconds after you hold down
A. Keep Adepressed for about four seconds until
the Local Time zone flashes.
2. Use Dand Bto scroll through city codes in the lower
display until the one you want is displayed.
•For full information on city codes, see the “City Code
Table” at the back of this manual.
•The time zone that is highlighted in the world map
will change in accordance with the Local Time City
code you select.
3. Press Ato exit the setting screen.
Local Time City
Hour : Minutes
Map
Local Time City code
E-17
3. Press Dto toggle between Daylight Saving Time (ON displayed) and Standard
Time (OFF displayed).
•Note that you cannot switch between Standard Time and Daylight Saving Time
(DST) while UTC is selected as your Home City.
4. Press Ato exit the setting screen.
•The DST indicator will be in the lower left corner of the display while Daylight
Saving Time is enabled.
Local Time
Local Time lets you separately display the current time in a specific time zone (Local
Time City). This feature is very handy for business professionals and others who need
to keep track of the current time in multiple time zones. A simple operation swaps your
Home City and Local Time City, which is great for travel between time zones.
E-16
Daylight Saving Time (DST) Setting
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.
To toggle the Timekeeping Mode time between DST and Standard Time
1. In the Timekeeping Mode, hold down Afor about two
seconds until the time zone of the currently selected
Home City starts to flash on the world map. This is the
setting screen.
•Release Aimmediately after the Home City code
appears. Keeping it depressed longer (about four
seconds) will switch to the Local Time City setting
screen.
2. Press Conce to display the DST setting screen.
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On/Off status
DST indicator
E-15
Screen To do this: Do this:
Change the year
Use D(+) and B(–).
Change the month or day
•For details about the above settings, see “Timekeeping” (page E-66).
5. Press Ato exit the setting screen.
•For details about other settings, refer to the sections below.
–Button Operation Tone: “To turn the button operation tone on and off” (page E-63)
–Illumination Duration: “To change the illumination duration” (page E-60)
•See “Daylight Saving Time (DST) Setting” below for details about the DST setting.
E-14
4. When the timekeeping setting you want to change is flashing, use Dand/or Bto
change it as described below.
Screen To do this: Do this:
Change the city code Use D(east) and B
(west).
Toggle between Daylight Saving Time
(ON) and Standard Time (OFF). Press D.
Toggle between 12-hour (12H) and
24-hour (24H) timekeeping. Press D.
Reset the seconds to 00 Press D.
Change the hour or minute Use D(+) and B(–).
E-13
2. Use Dand Bto scroll through city codes in the lower display until the one you
want is displayed.
•Make sure you select your Home City code before changing any other setting.
•For full information on city codes, see the “City Code Table” at the back of this
manual.
3. Press Cto move the flashing in the sequence shown below to select the other
settings.
City Code DST 12/24-Hour
Format
Button Operation
Tone (page E-63)
Illumination Duration
(page E-60)
Second Hour
YearMonthDay
Minute
•After a city code is displayed, it will scroll once to show the full city name.
•The following steps explain how to configure timekeeping settings only.
E-12
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 first
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.
•Note that all of the times for the World Time Mode city codes (page E-48) and Local
Time city codes (page E-18) are displayed in accordance with the time and date
settings you configure in the Timekeeping Mode.
To set your Home City time and date
1. In the Timekeeping Mode, hold down Afor about two seconds until the time zone
of the currently selected Home City starts to flash on the world map. This is the
setting screen.
•The Home City code will also appear on the display. Release Aimmediately
after the Home City code appears. Keeping it depressed longer (about four
seconds) will switch to the Local Time City setting screen, which is indicated
when the Local Time City code is displayed.
E-11
You can adjust the Home Time city date and time in the
Timekeeping Mode. You also can simultaneously display
the current time in one other time zone, by specifying a
Local Time City.
•For information about selecting a Local Time City, see
“To specify the Local Time City” (page E-18).
Local Time City
Hour : Minutes
Map
Home City
Hour : Minutes, Seconds
Day of week, Month - Day
E-10
Timekeeping
This watch can keep track of the current time in up to three different time zones.
Home Time
•This is the time in the city where you normally use your watch (Home City). It is the
time displayed in the Timekeeping Mode.
Local Time
•This is the time in the city located in the time zone that is highlighted on the watch’s
world map (Local Time City).
World Time
•This is the time in the city you select in the World Time Mode (page E-47).

Operation Guide 3451
E-29
Note
•Note that taking a measurement
while the watch is not horizontal
(in relation to the horizon) can
result in large measurement error.
•The margin of error for the angle value and the direction indicator is ±15 degrees. If
the indicated direction is northwest (NW) and 315 degrees, for example, the actual
direction can be anywhere from 300 to 330 degrees.
•Any ongoing direction measurement operation is paused temporarily while the
watch is performing an alert operation (daily alarm, Hourly Time Signal, countdown
timer alarm) or while illumination is turned on (by pressing B). The measurement
operation resumes for its remaining duration after the operation that caused it to
pause is finished.
•The following table shows the meanings of each of the direction abbreviations that
appear on the display.
E-28
•While the watch is taking compass readings, it
displays a direction angle and a direction indicator,
both of which change dynamically when the watch is
moved. After the compass operation is complete, the
direction pointer disappears from the display, and
the direction angle and direction indicator both show
“- - -”. Use the direction indicators marked around
the compass dial to record the indicated direction.
For details, see “Example: Determining your current
position and your objective on a map” (page E-31).
•The CAL appearing on the display after a direction
reading is complete indicates that bearing sensor
calibration is required due to either of the reasons
described below. When this happens, perform the
procedure under “Calibrating the Bearing Sensor”
(page E-33).
•It’s been 100 days since the last bearing sensor
calibration.
•The watch’s battery was replaced.
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E-27
To take a direction reading
1. While the watch is in the Digital Compass/Thermometer
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 o’clock position of the compass dial in the
direction you want to measure.
3. Press Dto start a Digital Compass measurement
operation.
•After about two seconds, the direction that the 12
o’clock position of the compass dial is pointing
appears on the display.
•The compass dial’s pointer indicates magnetic north.
•After the first reading is obtained, the watch
continues to take direction readings automatically
each second, for up to 10 seconds.
•To perform direction readings for another 10
seconds, press Dagain.
NW
0°
WNW
W
WSW
SW
SSW
S
SSE
SE
ESE
E
ENE
NE
NNE
N
NNW
90°
180°
270°
12 o’clock
North pointer
Angle value
(in degrees)
Direction
indicator
E-26
Digital Compass
The watch takes digital compass readings automatically whenever you enter the
Digital Compass/Thermometer Mode. In addition, you can take readings manually by
performing the procedure below.
•See “Magnetic North and True North” (page E-39) for information about the two types of
north. For information about maximizing digital compass accuracy, see “Calibrating
the Bearing Sensor” (page E-33) and “Digital Compass Precautions” (page E-39).
E-25
2. Press Cto return to the Timekeeping Mode.
•For information about using the digital compass, see “To take a direction
reading” on page E-27.
•For information about using the thermometer, see “To take a temperature
reading” on page E-42.
E-24
To enter and exit the Digital Compass/Thermometer Mode
1. While in the Timekeeping Mode, press Dto enter the
Digital Compass/Thermometer Mode.
•The watch will start to take direction and temperature
readings. After about two seconds, the angle that the
12 o’clock position of the compass dial is facing and
the current temperature reading will appear on the
display.
•Direction readings will be taken each second for
about 10 seconds, and then stop automatically.
•Temperature readings will be taken every two
seconds for about 10 seconds, and then stop
automatically.
•To perform direction and temperature readings for
another 10 seconds, press Dagain.
During readings
12 o’clock
Home time About two
seconds
E-23
Digital Compass/Thermometer
You can take direction readings and temperature readings in the Digital Compass/
Thermometer Mode. Direction readings are taken by the watch’s built-in magnetic
bearing sensor and displayed as one of 16 directions. A temperature sensor is used
for temperature readings.
•See “Digital Compass” on page E-26 for more information about the digital compass.
•See “Thermometer” on page E-41 for more information about the thermometer.
E-22
Before Arriving at Your Destination
Swap your place of departure (Home City) and Local Time City.
Current time at place of departure Current time at destination
•For information about selecting a Local Time City, see “To specify the Local Time
City” (page E-18).
E-21
Before Setting Out
Set your destination city as the Local Time City.
Current time at place
of departure
Current time at destination
•For information about selecting a Local Time City, see “To specify the Local Time
City” (page E-18).
E-20
Swapping your Home City and Local Time City
You can use the procedure below to swap your Home City and Local Time City. This
capability can come in handy when you travel frequently between two cities in different
time zones.
To swap your Home City and Local Time City
1. In the Timekeeping Mode, select the Local Time City you want.
•For information about selecting a Local Time City, see “To specify the Local Time
City” (page E-18).
2. Hold down Bfor at least four seconds.
•This will make the Local Time City (which you selected in step 1) your Home City.
At the same time, it will change the Home City you had selected prior to step 2 to
your Local Time City.
Using the Watch when Travelling Between Time Zones
You can use the procedures below for smooth switching between time zones as
required.

Operation Guide 3451
E-39
Digital Compass Precautions
Magnetic North and True North
The northerly direction can be expressed either as
magnetic north or true north, which are different from each
other. Also, it is important to keep in mind that magnetic
north moves over time.
•Magnetic north is the north that is indicated by the
needle of a compass.
•True north, which is the location of the North Pole of the
Earth’s axis, is the north that is normally indicated on
maps.
•The difference between magnetic north and true north
is called the “declination”. The closer you get to the
North Pole, the greater the declination angle.
True north
Magnetic north
Earth
E-38
•You can select a value within the range of 90° W to 90° E with these settings.
•The following explains magnetic declination angle direction settings.
0 OFF: No magnetic declination correction performed. The magnetic
declination angle with this setting is 0°.
E: When magnetic north is to the east (east declination)
W: When magnetic north is to the west (west declination)
•You can turn off (0 OFF) magnetic declination correction (which effectively
makes the magnetic declination angle: 0°) by pressing Dand Bat the same
time.
•The illustration on page E-37, for example, shows the value you should input and the
direction setting you should select when the map shows a magnetic declination
of 1° West.
4. When the setting is the way you want, press Ato exit the setting screen.
E-37
To perform magnetic declination correction
1. In the Digital Compass/Thermometer Mode, hold down
Auntil the CAL starts to flash on the display. This is
the calibration screen.
2. Press C.
•The magnetic declination angle and magnetic
declination angle direction will flash on the display.
3. Use D(+) and B(–) to change the magnetic
declination angle and magnetic declination angle
direction settings.
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Magnetic declination
angle value
Magnetic declination
angle direction
E-36
4. As each dial segment disappears, rotate the watch so the neighboring segment (to
the right) is pointed north.
•After you complete rotation for one full set of segments, all segments will
re-appear and start disappearing again.
5. Repeat step 4 for the second set of segments.
•The calibration operation ends automatically after two sets of segment (two full
watch rotations) are complete. Either OK (successful) or ERR (unsuccessful) will
appear on the display. Press Ato complete the procedure or Dto calibrate
again.
•To stop a bearing sensor correction operation part way through, press Dand
then A.
E-35
To calibrate the bearing sensor
Rotate the watch as
each segment
disappears from
the bearing
indicator dial.
D
▲
▲
1. Remove the watch from your wrist, and position it so its back is parallel with the
ground and the 12 o’clock position of the compass dial is pointed away from you.
2. In the Digital Compass/Thermometer Mode hold down Auntil all the segments are
displayed in the bearing indicator dial.
3. Press D.
•This will cause the segments of the dial to disappear in clockwise sequence one-
by-one.
E-34
•Magnetic Declination Correction
With magnetic declination correction, you input a magnetic declination angle
(difference between magnetic north and true north), which allows the watch to
indicate true north. You can perform this procedure when the magnetic declination
angle is indicated on the map you are using.
Note that you can input the declination angle in degree units only, so you may need
to round off the value specified on the map. If your map indicates the declination
angle as 7.4°, you should input 7°. In the case of 7.6° input 8°, for 7.5° you can input
7° or 8°.
E-33
Calibrating the Bearing Sensor
If you feel that direction readings being produced by the watch are not correct for
some reason, you can calibrate the bearing sensor to correct them. You can use
either of two methods to calibrate the bearing sensor: bearing sensor correction or
magnetic declination correction.
You also need to calibrate the bearing sensor if 100 days pass without calibration, and
after you have the watch’s battery replaced. The message CAL will appear on the
display to remind you to calibrate.
•Bearing Sensor Correction
With bearing sensor correction, you rotate the watch in accordance with the
movement of an on-screen indicator. Doing this will recalibrate the magnetic sensor
of the watch with magnetic north for the area where you are located.
E-32
3. Rotate the map without moving the watch so the northerly direction indicated on the
map matches north as indicated by the watch.
•If the watch is configured to indicate magnetic north, align the map’s magnetic
north with the watch indication. If the watch has been configured with a
declination to correct to true north, align the map’s true north with the watch
indication.
•This will position the map in accordance with your current location.
4. Determine your location as you check the geographic contours around you.
E-31
Example: Determining your current position and your
objective on a map
Having an idea of your current location and the direction
to your destination is important when mountain climbing or
hiking. In this example, we show you how to plot directions
on a map and determine your current location using
direction measurements taken by the watch.
1. With the watch on your wrist, position it so the face is
horizontal.
2. In the Timekeeping Mode, press Dto take a compass
reading.
•The reading will appear on the display after about
two seconds.
N
N
North indicated
on the map
North indicated by
north pointer
Current
location
E-30
Direction Meaning Direction Meaning Direction Meaning Direction Meaning
NNorth NNE North-
northeast NE Northeast ENE East- northeast
EEast ESE East-
southeast SE Southeast SSE South- southeast
SSouth SSW South-
southwest SW Southwest WSW West- southwest
WWest WNW West-
northwest NW Northwest NNW North- northwest
•See “Digital Compass Precautions” on page E-39 for other important information about
taking direction readings.

Operation Guide 3451
E-49
•Note that the DST/Standard Time setting affects only the currently displayed city
code. Other city codes are not affected.
To swap your World Time City and Local Time City
1. In the World Time Mode, select the Local Time City you want.
•For information about selecting a Local Time City, see “To specify the Local Time
City” (page E-18).
2. Hold down Bfor at least four seconds.
•This will make the Local Time City (which you selected in step 1) your World
Time City. At the same time, it will change the World Time City you had selected
prior to step 2 to your Local Time City.
•After swapping the World Time City and Local Time City, the watch stays in the
World Time Mode with the city that was selected as the World Time City prior to
step 2 now displayed as the Local Time City.
E-48
To view the time in another city
In the World Time Mode, use D(east) to scroll through city codes (time zones).
•For full information on city codes, see the “City Code Table” at the back of this
manual.
To toggle a city code time between Standard Time and Daylight Saving Time
1. In the World Time Mode, use D(east) to display the
city code (time zone) whose Standard Time/Daylight
Saving Time setting you want to change.
2. Hold down Ato toggle between Daylight Saving Time
(DST indicator displayed) and Standard Time (DST
indicator not displayed).
•The DST indicator appears on the display whenever
you display a city code for which Daylight Saving
Time is turned on.
•Note that you cannot switch between Standard Time
and Daylight Saving Time (DST) while UTC is
selected as your World Time City.
DST indicator
E-47
World Time
The World Time Mode lets you look up the current time in
a third city, which can be any one of 48 cities (31 time
zones) around the world, or the UTC. This is in addition to
your more commonly used Home City and Local Time City
times displayed in the Timekeeping Mode.
You can also use the World Time Mode to simultaneously
display the current time in your Home City, Local Time
City, and World Time City.
•If the current time shown for a city is wrong, check your
Home City time settings and make the necessary
changes (page E-12).
•You also can swap the current World Time City and
Local Time City in the World Time Mode (page E-49).
•All of the operations in this section are performed in the
World Time Mode, which you enter by pressing C
(page E-9).
Local Time
City time
World Time
City code
World Time
City time
Home City
time
E-46
To specify the temperature display unit
1. In the Digital Compass/Thermometer Mode, hold down
Auntil CAL starts to flash on the display.
2. Press Cthree times and the current temperature
display unit will flash on the display. This is the
temperature display unit setting screen.
3. Use Dto switch between Celsius (°C) and Fahrenheit
(°F).
•You will not be able to change the temperature
display unit if TYO (Tokyo) is selected as your Home
City.
4. Press Ato exit the setting screen.
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E-45
To calibrate the temperature sensor
1. In the Digital Compass/Thermometer Mode, hold down
Auntil CAL starts to flash on the display.
2. Press Ctwice and the current temperature calibration
value will flash on the display. This is the temperature
sensor calibration screen.
3. Use D(+) and B(–) to change the calibration value.
•To return the temperature sensor to its factory default
calibration, press Dand Bat the same time.
4. To exit the calibration screen, press A.
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Current temperature
calibration value
E-44
Important!
•Incorrectly calibrating the temperature sensor can result in incorrect readings.
Carefully read the following before doing anything.
– Compare the readings produced by the watch with those of another reliable and
accurate thermometer.
– If adjustment is required, remove the watch from your wrist and wait for
approximately 20 or 30 minutes to give the temperature of the watch time to
stabilize.
E-43
Important!
•Temperature measurements are affected by your body temperature (while you are
wearing the watch), direct sunlight, and moisture. To achieve a more accurate
temperature measurement, remove the watch from your wrist, place it in a well
ventilated location out of direct sunlight, and wipe all moisture from the case. It
takes approximately 20 to 30 minutes for the case of the watch to reach the actual
surrounding temperature.
Temperature Sensor Calibration
The temperature sensor built into the watch is calibrated at the factory, and normally
does not need any adjustment. However, if you feel that readings being produced by
the watch are not correct for some reason, you can calibrate the temperature sensor
to correct them.
E-42
To take a temperature reading
In the Digital Compass/Thermometer Mode, press D.
•This will display the temperature reading.
•After the first reading, the watch will continue to take
readings every two seconds for about 10 seconds.
•After the temperature reading is complete, the
temperature display will show “- -.-”.
•To perform temperature readings for another 10
seconds, press Dagain.
•The temperature is displayed in units of 0.1°C (or 0.2°F).
•The display range of the thermometer screen is –10.0°C
to 60.0°C (or 14.0°F to 140.0°F). The temperature
display will show “- -.-” if a temperature reading is
outside the allowable range.
Temperature
E-41
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” (page E-33).
Thermometer
The watch takes temperature readings automatically whenever you enter the Digital
Compass/Thermometer Mode.
•You can calibrate the temperature sensor (page E-43) if you think readings are wrong
for some reason.
•You can select either Celsius (°C) or Fahrenheit (°F) as the temperature unit (page
E-46).
E-40
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 also are impossible indoors, especially inside ferro-concrete
structures. This is because the metal framework of such structures picks up
magnetism from appliances, etc.

Operation Guide 3451
E-59
Illumination
This watch has an EL (electro-luminescent) panel that
causes the entire display to glow for easy reading in the
dark.
•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 turns off automatically whenever an alarm
sounds.
•Frequent use of illumination runs down the battery.
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E-58
To turn an alarm and the hourly time signal on and off
1. In the Alarm Mode, use Dto select an alarm or the hourly time signal.
2. When the alarm or the hourly time signal you want is selected, press Ato toggle it
on and off.
: Indicates alarm is on.
: Indicates snooze alarm is on.
: Indicates Hourly Time Signal is on.
•The alarm on indicator ( ), snooze on indicator ( ), and hourly time
signal on indicator ( ) are displayed on all modes.
•If any alarm is on, the alarm on indicator is shown on the display in all modes.
E-57
Alarm Operation
The alarm tone sounds at the preset time for 10 seconds, regardless of the mode the
watch is in. In the case of the snooze alarm, the alarm operation is performed a total
of seven times, every five minutes, until you turn the alarm off (page E-58).
•Alarm and hourly time signal operations are performed in accordance with the
Timekeeping Mode time.
•To stop the alarm tone after it starts to sound, press any button.
•Performing any one of the following operations during a 5-minute interval between
snooze alarms cancels the current snooze alarm operation.
– Displaying the Timekeeping Mode setting screen (page E-12)
– Displaying the SNZ setting screen (page E-56)
– Swapping the Home City time and Local Time City time in the Timekeeping Mode
(page E-20)
– Changing the DST setting for a city in the World Time Mode while the same city is
selected for the Home City (page E-48)
To test the alarm
In the Alarm Mode, hold down Dto sound the alarm.
E-56
To set an alarm time
1. In the Alarm Mode, use Dto scroll through the alarm
screens until the one whose time you want to set is
displayed.
AL1
SIG
AL2
SNZ
AL3
AL4
D
2. Hold down Auntil the hour setting of the alarm time start to flash, which indicates
the setting screen.
•This automatically turns on the alarm.
3. Press Cto move the flashing between the hour and minute settings.
4. 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. (no indicator) or p.m. (Pindicator).
5. Press Ato exit the setting screen.
Alarm on indicator
E-55
Alarms
The Alarm Mode gives you a choice of four daily alarms
and one snooze alarm. Also use the Alarm Mode to turn
the hourly time signal (SIG) on and off.
•There are five alarms numbered AL1 through AL4, and
SNZ. You can configure SNZ as a snooze alarm only.
Alarms AL1 through AL4 can be used as daily alarms
only.
•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 C(page E-9).
Home time
Alarm number
Alarm time
(Hour : Minutes)
E-54
•While the auto-repeat on/off setting (ON or OFF) is flashing on the display, press
Dto toggle auto-repeat on (ON) and off (OFF).
4. Press Ato exit the setting screen.
•The auto-repeat on indicator ( ) is displayed on the Countdown Timer Mode
screen while this function is turned on.
•Frequent use of auto-repeat and the alarm can run down battery power.
To use the countdown timer
Press Dwhile in the Countdown Timer Mode to start the countdown timer.
•When the end of the countdown is reached and auto-repeat is turned off, the alarm
sounds for 10 seconds or until you stop it by pressing any button. The countdown
time is automatically reset to its starting value after the alarm stops.
•When auto-repeat is turned on, the countdown will restart automatically without
pausing when it reaches zero. The alarm sounds to signal when the countdown
reaches zero.
•The countdown timer measurement operation continues even if you exit the
Countdown Timer Mode.
•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.
E-53
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 Auntil the hour
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” (page
E-54) to display it.
2. Press Cto move the flashing in the sequence shown
below, and select the setting you want to change.
Start Time
(Hours)
Start Time
(Minutes)
Auto-Repeat
On/Off
3. Perform the following operations, depending on which
setting is currently selected on the display.
•While the start time setting is flashing, use D(+) and
B(–) to change it. Set 0:00 to specify 24 hours.
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Auto-repeat on indicator
E-52
Countdown Timer
You can set the countdown timer within a range of one
minute to 24 hours. An alarm sounds when the countdown
reaches zero.
•You also can select auto-repeat, which automatically
restarts the countdown from the original value you set
whenever zero is reached.
•All of the operations in this section are performed in the
Countdown Timer Mode, which you enter by pressing
C(page E-9).
Home time
Seconds
MinutesHours
E-51
To measure times with the stopwatch
Elapsed Time
DD D D A
Start Stop Resume Stop Clear
Split Time
DA A D A
Start Split
(SPL displayed)
Split release Stop Clear
Two Finishes
DA D A A
Start Split
First runner
finishes.
Display time of
first runner.
Stop
Second runner
finishes.
Split release
Display time of
second runner.
Clear
E-50
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.
•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 C
(page E-9).
Home time
1/100 second
SecondsMinutes

Operation Guide 3451
E-69
Battery: One lithium battery (Type: CR2025)
Approximately 5 years on type CR2025 (Alarm operation 10 seconds/day;
Illumination operation 1.5 seconds/day; Direction reading operation 20 seconds/
day; temperature reading operation 20 seconds/day)
Frequent use of the light shortens the battery life.
E-68
World Time: 48 cities (31 time zones); UTC; World Time City/Local Time City
swapping
Other: Standard time/Daylight Saving Time
Stopwatch:
Measuring unit: 1/100 second
Measuring capacity: 59' 59.99"
Measuring modes: Elapsed time, split time, two finishes
Countdown Timer:
Measuring unit: 1 second
Input range: 1 minute to 24 hours (1-minute increments and 1-hour increments)
Other: Auto-repeat timing
Alarms: 5 daily alarms (with 1 snooze alarm); Hourly time signal
Illumination: EL (electro-luminescent panel); Selectable illumination duration
(approximately 1.5 seconds or 3 seconds)
Other: Button operation tone on/off
E-67
Specifications
Accuracy at normal temperature: ± 20 seconds a month
Timekeeping: Hour, minutes, seconds, p.m. (P), month, day, day of the week
Time format: 12-hour and 24-hour
Calendar system: Full Auto-calendar pre-programmed from the year 2000 to 2099
Other: Home City code (can be assigned one of 48 city codes); Daylight Saving
Time (summer time)/Standard Time; Simultaneous Home Time/Local Time;
Home City/Local Time City swapping
Digital Compass:
16 directions; Angle values from 0° to 359°; North pointer
Reading Timing: Continuous operation every second for 10 seconds
Other: Bearing sensor correction; Magnetic declination correction
Thermometer:
Measurement and Display Range: –10.0°C to 60.0°C (or 14.0°F to 140.0°F)
Display Unit: 0.1°C (or 0.2°F)
Reading Timing: Continuous operation every two seconds for 10 seconds
Other: Temperature sensor calibration
E-66
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.
•With the 12-hour format, the P(PM) indicator appears on the display for times in the
range of noon to 11:59 p.m. and no indicator 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.
•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.
E-65
•If an error occurs or the battery goes low during sensor operation, ERR or BATT
will appear in the lower left of the display for about 10 seconds, and then change to
- - -.
•If an error occurs or the battery goes low during bearing sensor correction, ERR or
BATT will appear in the lower left of the display for about one second, and then the
calibration screen will appear. Try performing calibration again.
•If an error occurs or the battery goes low during temperature sensor calibration,
ERR or BATT will appear on the display for about one second. Next, ---will flash
for the temperature value in the lower part of the display. This indicates that
temperature sensor calibration is not possible. Press Ato exit the calibration
screen, and then try performing temperature sensor calibration again.
•If the ERR message appears frequently, it could mean the sensor is malfunctioning.
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.
E-64
4. Press Ato exit the setting screen.
•The indicator is displayed in all modes when the button operation tone is
turned off.
Data and Setting Scrolling
The Band Dbuttons are used in various modes and setting screens 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 Error and Low Battery Displays
Subjecting the watch to strong impact can damage the sensor or cause internal
connection problems. These conditions will cause ERR (error) to appear on the
display, indicating that sensor operation is disabled. Sensor operation also is disabled
whenever BATT (battery) is on the display, which indicates insufficient battery power
or voltage due to a low battery or a cold environment.
E-63
To turn the button operation tone on and off
1. In the Timekeeping Mode, hold down Afor about two
seconds until the time zone of the currently selected
Home City starts to flash on the world map. This is the
setting screen.
•Release Aimmediately after the Home City code
appears. Keeping it depressed longer (about four
seconds) will switch to the Local Time City setting
screen.
2. Press Cnine times to display the button operation
tone setting.
•See the sequence in step 3 of the procedure under
“To set your Home City time and date” (page E-12) for
information about how to scroll through setting
screens.
3. Press Dto toggle the button operation tone on ( not
displayed) and off ( displayed).
Mute indicator
E-62
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 Return Feature
•The watch will return to the Timekeeping Mode automatically if you do not perform
any operation for about two or three minutes while in the Digital Compass/
Thermometer Mode or Alarm Mode.
•If you leave a screen with flashing digits on the display without performing any
operation for two or three minutes, the watch saves any settings you have made up
to that point and exits the setting screen automatically.
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.
E-61
3. Press Dto toggle the illumination duration between three seconds (3displayed)
and 1.5 seconds (1displayed).
4. Press Ato exit the setting screen.
E-60
To turn on illumination
In any mode (except when a setting screen is on the display), press Bto illuminate
the display for about one second.
To change the illumination duration
1. In the Timekeeping Mode, hold down Afor about two
seconds until the time zone of the currently selected
Home City starts to flash on the world map. This is the
setting screen.
•Release Aimmediately after the Home City code
appears. Keeping it depressed longer (about four
seconds) will switch to the Local Time City setting
screen.
2. Press C10 times to display the illumination duration setting screen.
•See the sequence in step 3 of the procedure under “To set your Home City time
and date” (page E-12) for information about how to scroll through setting screens.
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Operation Guide 3451
L-3
City
Code City UTC Offset/
GMT Differential
SEL Seoul +09.0
TYO Tokyo
ADL Adelaide +09.5
GUM Guam +10.0
SYD Sydney
NOU Noumea +11.0
WLG Wellington +12.0
xBased on data as of January 2016.
xThe rules governing global times (GMT
differential and UTC offset) and
summer time are determined by each
individual country.
L-2
City
Code City UTC Offset/
GMT Differential
MAD Madrid
+01.0
PAR Paris
ROM Rome
BER Berlin
STO Stockholm
ATH Athens
+02.0CAI Cairo
JRS Jerusalem
MOW Moscow +03.0
JED Jeddah
THR Tehran +03.5
DXB Dubai +04.0
City
Code City UTC Offset/
GMT Differential
KBL Kabul +04.5
KHI Karachi +05.0
DEL Delhi +05.5
KTM Kathmandu +05.75
DAC Dhaka +06.0
RGN Yangon +06.5
BKK Bangkok +07.0
SIN Singapore
+08.0
HKG Hong Kong
BJS Beijing
TPE Taipei
L-1
City Code Table
City
Code City UTC Offset/
GMT Differential
PPG Pago Pago –11.0
HNL Honolulu –10.0
ANC Anchorage –09.0
YVR Vancouver –08.0
LAX Los Angeles
YEA Edmonton –07.0
DEN Denver
MEX Mexico City –06.0
CHI Chicago
NYC New York –05.0
City
Code City UTC Offset/
GMT Differential
YHZ Halifax –04.0
YYT St. Johns –03.5
BUE Bueno Aires –03.0
RIO Rio De Janeiro
FEN F. De Noronha –02.0
RAI Praia –01.0
UTC –
+00.0LIS Lisbon
LON London