Casio Prw2500t7 Manual

							Operation Guide 3258
E-80
Adjusting the High Tide Time
Use the following procedure to adjust the high tide time within a particular date. You can fi nd out high tide 
information for your area from a tide table, the Internet, or your local newspaper.
To adjust the high tide time
1. In the Tide/Moon Data Mode, use A
 (+) and C
 (–) to scroll to the 
date whose high tide time you want to change.
2. Hold down E
 until SET Hold
 appears on the display and then the 
hour digits start to fl ash.
3. Press A
 (+) and C
 (–) to change the hour setting.
4. When the hour is the setting you want, press D
.
• This will cause the minute digits to fl ash.
5. Press A
 (+) and C
 (–) to change the minute setting.
6. When the minute setting is the way you want, press E
 to exit the 
adjustment screen and return to the Tide/Moon Data Mode screen.
• Pressing A
 and C
 at the same time while the time adjustment 
screen is displayed (steps 3 through 6 above) will return the high 
tide time to its initial factory default setting.
• Changing the Home City setting in the Timekeeping Mode returns 
the high tide time to its initial value.
• The high tide time setting is not affected by the DST (summer time) 
setting of the Timekeeping Mode.
• On some days, there are two high tides. With this watch, you can 
adjust the fi rst high tide time only. The second high tide time for that 
day is adjusted automatically based on the fi rst high tide time.
E-81
Reversing the Displayed Moon Phase
The left-right (east-west) appearance of the Moon depends on whether the Moon is north of you (northerly 
view) or south of you (southerly view) as you view it.
You can use the procedure below to reverse the displayed Moon phase so it matches the actual 
appearance of the Moon where you are located.
• To determine the viewing direction of the Moon, use a compass to take a direction reading of the Moon 
at its meridian passage.
• For information about the Moon phase indicator, see “Moon Phase Indicator” (page E-82).
To reverse the displayed Moon phase
1. In the Tide/Moon Data Mode, hold down E
 until SET Hold
 appears 
on the display and then the hour digits start to fl ash.
2. Press D
 twice.
• This will cause the Moon phase indicator to fl ash. This is the 
indicator switching screen.
3. Press A
 to toggle the Moon phase indicator between the southerly 
view (indicated by 
) and northerly view (indicated by  ).• Northerly view: Moon is north of you.• Southerly view: Moon is south of you.
4. When the Moon phase indicator setting is the way you want, press E
to exit the switching screen and return to the Tide/Moon Data Mode 
screen.
E-82
Moon Phases and Moon Age
The Moon goes through a regular 29.53-day cycle. During each cycle, the Moon appears to wax and 
wane as the relative positioning of the Earth, Moon, and Sun changes. The greater the angular distance 
between the Moon and the Sun,* the more we see illuminated.
* The angle to the Moon in relation to the direction at which the Sun is visible from the Earth.
This watch performs a rough calculation of the current Moon age starting from day 0 of the moon age 
cycle. Since this watch performs calculations using integer values only (no fractions), the margin for error 
of the displayed Moon age is ± 1 day.
Moon Phase IndicatorThe Moon phase indicator of this watch indicates the current phase of the 
Moon as shown below. It is based on the view of the left side of the moon 
at meridian transit from the northern hemisphere of the Earth. If the 
appearance of the Moon phase indicator is reversed from the actual 
Moon as viewed from your location, you can use the procedure under “To 
reverse the displayed Moon phase” (page E-81) to change the indicator.Moon phase indicator
Moon ageMoon phase indicator
Moon age
E-83
Moon Phase 
Indicator
Moon Age
Moon Phase
New
MoonFirst
Quarter
(Waxing)
28.7-29.8
0.0-0.91.0-2.7 2.8-4.6 6.5-8.34.7-6.4 8.4-10.1 10.2-12.0 12.1-13.8
Moon Phase 
Indicator
Moon Age
Moon Phase
Full
MoonLast
Quarter
(Waning) 13.9-15.715.8-17.5 17.6-19.4 21.3-23.119.5-21.2 23.2-24.9 25.0-26.8 26.9-28.6
Moon phase (part you can see) (part you cannot see)
E-84
Tidal Movements
Tides are the periodic rise and fall of the water of oceans, seas, bays, and other bodies of water caused 
mainly by the gravitational interactions between the Earth, Moon and Sun. Tides rise and fall about every 
six hours. The Tide Graph of this watch indicates tidal movement based on the Moon’s transit over a 
meridian and the lunitidal interval. The Tide Graph calculates and graphically represents current tide 
conditions in your Home City or a port city in the vicinity of the Home City based on longitudes, lunar day 
length, and lunitidal interval preset in watch memory, and on high tide times specifi ed by you.
Tide GraphThe Tide Graph graphically represents the current tide condition using one of three patterns that represent 
spring tide, intermediate tide, and neap tide, as shown below.
Tide Name Graph Description
Spring TideLarge difference between high tide 
and low tide. Occurs a few days 
before and after a New Moon and 
Full Moon.
Intermediate Tide
Medium difference between high tide 
and low tide.
Neap Tide
Small difference between high tide 
and low tide. Occurs a few days 
before and after the fi rst quarter and 
last quarter of a half moon.
E-85
• The Tide Graph fl ashes as shown below to indicate the tide range.High tide
Low tide
Lunitidal Interval
Theoretically, high tide is at the Moon’s transit over the meridian and low tide is about six hours later. 
Actual high tide occurs somewhat later, due to factors such as viscosity, friction, and underwater 
topography. Both the time differential between the Moon’s transit over the meridian until high tide and the 
time differential between the Moon’s transit over the meridian until low tide are known as the “lunitidal 
interval”.
E-86
Using the Alarm
You can set fi ve independent daily alarms. When an alarm is turned on, 
an alarm will sound for about 10 seconds each day when the time in the 
Timekeeping Mode reaches the preset alarm time. This is true even if the 
watch is not in the Timekeeping Mode.
You can also turn on an Hourly Time Signal, which will cause the watch 
to beep twice every hour on the hour.
To enter the Alarm Mode
Use
Dto select the Alarm Mode (ALM
) as shown on page E-24.• About one second after ALM
 appears on the display, the display will 
change to show an alarm number (AL1
 through AL5
) or the SIG
indicator. The alarm number 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 fi rst.
Alarm number or SIG
Alarm time 
(Hour : Minutes)Current timeAlarm number or SIG
Alarm time 
(Hour : Minutes)Current time
E-87
To set an alarm time
1. In the Alarm Mode, use A
 and C
 to scroll through the alarm screens 
until the one whose time you want to set is displayed.
AL1AL2 AL3
SIG AL5
AL4
2. Hold down E
 until SET Hold appears on the display and then the 
current settings star t to fl ash.
• This is the setting screen.
3. Press D
 to move the fl ashing between the hour and minute settings.
4. While a setting is fl ashing, use A
 (+) and C
 (–) 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. (P indicator).
5. Press E
 to exit the setting screen.
Alarm ON/OFF 
indicatorAlarm ON/OFF 
indicator 
						

							Operation Guide 3258
E-88
To turn an alarm and the Hourly Time Signal on and off
1. In the Alarm Mode, use A
 and C
 to select an alarm or the Hourly Time Signal.
2. When the alarm or the Hourly Time Signal you want is selected, press B
 to turn it on and off.
•An alarm on indicator will be on the display whenever any alarm (one 
or multiple) is turned on. An hourly time signal on indicator is displayed 
while the hourly time signal is on.
• If any alarm is on, the alarm on indicator is shown on the display in 
all modes.
To stop the alarm
Press any button.
Hourly time signal 
on indicator Alarm on indicatorHourly time signal 
on indicator Alarm on indicator
E-89
Using the Stopwatch
The stopwatch measures elapsed time, split times, and two fi nishes.
To enter the Stopwatch Mode
UseD
 to select the Stopwatch Mode (STW
) as shown on page E-24.
To perform an elapsed time operation
A
AAACStart Stop (Restart) (Stop) Reset
To pause at a split time
A
CCACStart Split
(SPL
 appears in 
the upper part of 
the display.)Split release Stop Reset
Current time Hours
Seconds Minutes
1/100
second
Current time Hours
Seconds Minutes
1/100
second
E-90
To measure two fi nishes
A
CACCStart Split
First runner fi nishes.
(SPL
 appears in the 
upper part of the 
display.)
Display time of fi rst 
runnerStop
Second runner 
fi nishes.Split release
Display time of 
second runnerReset
Note• The Stopwatch Mode can indicate elapsed time up to 23 hours, 59 minutes, 59.99 seconds.• Once started, stopwatch timing continues until you press C
 to stop it, even if you exit the Stopwatch 
Mode to another mode and even if timing reaches the stopwatch limit defi ned above.
• Exiting the Stopwatch Mode while a split time is frozen on the display clears the split time and returns 
to elapsed time measurement.
E-91
Using the Countdown Timer
In addition to normal countdown timing, you can press a button during a countdown operation to reset the 
timer and restart timing. This capability comes in handy in the case of a yacht race, for example, in which 
a warning signal is given fi ve minutes before the start of a race.
To enter the Countdown Timer Mode
UseD
 to select the Countdown Timer Mode (TMR
) as shown on page E-24.
Countdown Timer ExampleUsing the Normal Countdown Timer• Progress beeper: OFF
10'00" 0'00"
Countdown time: 10 minutes Countdown beeper: Each second for the final 10 secondsTime up alert
E-92
Reset Time
Using a Reset Time
• Progress beeper: ON1 Reset time start alert: Once each second for fi nal 10 seconds2 Time up alert: Each minute
10'00" 5'00" 0'00"Reset time: 5 minutesCountdown time: 10 minutes
Time up alert
Countdown beeper: Each second for the final 10 seconds
Timer SettingsCountdown Time• You can select from one minute to 60 minutes.• You can select in one-minute steps.
Reset Time
• You can select from one minute to fi ve minutes, within the range of the timer time.• You can select in one-minute steps.
E-93
Note• See “To confi gure countdown timer settings” for information about setting up the timer.• When the progress beeper is off, only the countdown beeper and time up alert sound.
To confi gure countdown timer settings
1. Enter the Countdown Timer Mode.
• If a countdown is in progress (indicated by the seconds counting 
down), press A
 to stop it and then press C
 to reset to the current 
countdown start time.
• If a countdown is paused, press C
 to reset to the current 
countdown start time.
2. Hold down E
 until the minute setting of the current countdown start 
time starts to fl ash. This is the setting screen.
3. Press D
 to toggle the display between the countdown time (TMR
) or 
reset time (RST
).
4. When the setting you want is fl ashing, use A
 (+) and C
 (–) to change 
the minutes setting.
5. Press E
 to exit the setting screen.
E-94
To use the countdown timer
Using the Countdown Timer as a Normal Timer
A
AAACStartStop Restart StopReturn to countdown 
start time
Using a Reset Time
A
CAACStartReturn to 
reset timeRestart StopReturn to countdown 
start time
PressC
 again to return to countdown start time.• The watch beeps every second for the last 10 seconds before the end of the countdown.• The fi nal 10-second countdown beeps and time up alert sound even if the watch is not in the 
Countdown Timer Mode.
To turn the progress beeper on and off
PressingB
 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).
E-95
Checking the Current Time in a Different Time Zone
You can use the World Time Mode to view the current time in one of 31 time zones (48 cities) around the 
globe. The city that is currently selected in the World Time Mode is called the “World Time City”.
To enter the World Time Mode
UseD
 to select the World Time Mode (WT
) as shown on page E-24.
•About one second after WT
 appears on the display, the display will 
change to show the city code of the currently selected World Time City.
To view the time in another time zone
In the World Time Mode, use A
 (East) and C
 (West) to scroll through 
city codes.
Currently selected 
Word Time City
Current timekeeping 
Mode time
Current time in the currently 
selected World Time CityCurrently selected 
Word Time City
Current timekeeping 
Mode time
Current time in the currently 
selected World Time City 
						

							Operation Guide 3258
E-96
To specify standard time or daylight saving time (DST) for a city
1. In the World Time Mode, use A
 (East) and C
 (West) to scroll through 
the available city codes.
• Keep scrolling until the city code whose Standard Time/Daylight 
Saving Time setting you want to change is displayed.
2. Hold down E
 until DST Hold
 appears on the display and then Hold
disappears.
• This toggles the city code you selected in step 1 between Daylight 
Saving Time (DST indicator displayed) and standard time (DST
indicator not displayed).
• Using the World Time Mode to change the DST setting of the 
city code that is selected as your Home City also will change the 
Timekeeping Mode time DST setting.
• Note that you cannot switch between standard time/daylight 
saving time (DST) while UTC is selected as the World Time City.
• Note that the standard time/daylight saving time (DST) setting 
affects only the currently selected time zone. Other time zones are 
not affected.
DST indicatorDST indicator
E-97
Illumination
The display of the watch is illuminated for easy reading in the dark.
The watch’s auto light switch turns on illumination automatically when 
you angle the watch towards your face.
• The auto light switch must be turned on (page E-99) for it to operate.
To turn on illumination manually
PressL
 in any mode to illuminate the display.
• You can use the procedure below to select either 1.5 seconds or three 
seconds as the illumination duration. When you press L
, the display 
will remain illuminated for about 1.5 seconds or three seconds, 
depending on the current illumination duration setting.
• The above operation turns on illumination regardless of the current 
auto light switch setting.
• Illumination is disabled during time calibration signal reception, while 
confi guring sensor measurement mode settings, and during bearing 
sensor calibration.
To change the illumination duration
1. In the Timekeeping Mode, hold down E
 until SET Hold
 appears on the display and then the city code 
starts to fl ash.
2. Use D
 to cycle through the settings on the display until the current illumination duration (LT1
 or LT3
) is 
shown.
• See the sequence in step 2 of the procedure under “To change the current time and date 
settings manually” (page E-32) for information about how to scroll through setting screens.
E-98
3. Press A
 to toggle the illumination duration between three seconds (LT3
 displayed) and 1.5 seconds
(LT1
 displayed).
4. After all of the settings are the way you want, press E
 to exit the setting screen.
• To return to the screen in step 1, press E
 again.
About the Auto Light SwitchTurning on the auto light switch causes illumination to turn on, 
whenever you position your wrist as described below in any mode.
Moving the watch to a position that is parallel to the ground and 
then tilting it towards you more than 40 degrees causes 
illumination to turn on.
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 traffi c accident 
and serious personal injury.
More than 
40°
Wear the watch on the 
outside of your wristMore than 
40°
Wear the watch on the 
outside of your wrist
E-99
Note• This watch features a “Full Auto EL Light”, so the auto light switch operates only when available light is 
below a certain level. It does not illuminate the display under bright light.
• The auto light switch is always disabled, regardless of its on/off setting, when any one of the following 
conditions exists.
While an alarm is sounding
During sensor measurement
While a bearing sensor calibration operation is being performed in the Digital Compass Mode
While a receive operation is in progress in the Receive Mode
While the Moon age or tide information is being calculated
To turn the auto light switch on and off
In the Timekeeping Mode, hold down L
 for about three seconds to toggle 
the auto light switch on ( displayed) and off (  not displayed).• The auto light switch on indicator () is on the display in all modes 
while the auto light switch is turned on.
• The auto light switch turns off automatically whenever battery power 
drops to Level 4 (page E-10).
Auto light switch on 
indicatorAuto light switch on 
indicator
E-100
Illumination Precautions• The electro-luminescent panel that provides illumination loses power after very long use.• Illumination may be hard to see when viewed under direct sunlight.• Illumination turns off automatically whenever an alarm sounds.• Frequent use of illumination runs down the battery.
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.
• 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 (page E-97), even if you 
keep the watch pointed towards your face.
• 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.
• 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.
E-101
Other Settings
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
1. In the Timekeeping Mode, hold down E
 until SET Hold
 appears on 
the display and then the city code starts to fl ash.
2. Use D
 to cycle through settings on the display until the current button 
operation tone (MUTE
 or BEEP
) is displayed.
• See the sequence in step 2 of the procedure under “To change the 
current time and date settings manually” (page E-32) for 
information about how to scroll through setting screens.
3.
PressA
 to toggle the button operation tone on (BEEP) and off (MUTE
).4. After all of the settings are the way you want, press E
 to exit the 
setting screen.
• To return to the screen in step 1, press E
 again.
Note
• The mute indicator is displayed in all modes when the button 
operation tone is turned off.Mute indicatorMute indicator
E-102
To turn Power Saving on and off
1. In the Timekeeping Mode, hold down E
 until SET Hold
 appears on 
the display and then the city code starts to fl ash.
2. Use D
 to cycle through the settings on the display until the the current 
power saving setting (On
 or OFF
) is displayed.
• See the sequence in step 2 of the procedure under “To change 
the current time and date settings manually” (page E-32) for 
information about how to scroll through setting screens.
3. Press A
 to toggle Power Saving on (On
) and off (OFF
).
4. After all of the settings are the way you want, press E
 to exit the 
setting screen.
• To return to the screen in step 1, press E
 again.
Note
• The Power Saving on indicator (PS) is on the display in all modes 
while Power Saving is turned on.
Power saving 
on indicatorPower saving 
on indicator
E-103
Troubleshooting
Time Setting
See “Radio Controlled Atomic Timekeeping” (page E-14) for information about adjusting the time setting 
according to a time calibration signal.
■ The current time setting is off by hours.
Your Home City setting may be wrong (page E-28). Check your Home City setting and correct it, if 
necessary.
■ The current time setting is off by one hour.
If you are using the watch in an area where time calibration signal reception is possible, see “To confi gure 
Home City settings” (page E-28).
If you are using in the watch in an area where time calibration signal reception is not possible, you may 
need to change your Home City’s standard time/daylight saving time (DST) setting manually. Use the 
procedure under “To change the current time and date settings manually” (page E-31) to change the 
standard time/daylight saving time (DST) setting.
Sensor modes
■ I can’t change the temperature, barometric pressure, and altitude units.
WhenTYO
 (Tokyo) is selected as the Home City, the altitude unit is set automatically to meters (m), the 
barometric pressure unit to hectopascals (hPa), and the temperature unit to Celsius (°C). These settings 
cannot be changed. 
						

							Operation Guide 3258
E-104
■ “ERR” appears on the display while I am using a sensor.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
MeasurementBarometric
Pressure/Temperature
MeasurementAltitude
Measurement
• If ERR
 appears while a measurement operation is being performed in a sensor mode, restart the measurement. 
IfERR
 appears on the display again, it can mean there is something wrong with the sensor.
•Even if battery power is at Level 1 (H
) or Level 2 (M
), the Digital Compass Mode, Barometer/
Thermometer Mode, or Altimeter Mode sensor may be disabled if there is not enough voltage available 
to power it suffi ciently. 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.
E-105
■ ERR appears on the display after I perform bidirectional calibration or northerly calibration.
If- - -
 appears and then changes to ERR
 (error) on the calibration screen, it means that there is something 
wrong with the sensor.
• If ERR
 disappears after about one second, try performing the calibration again.• If ERR
 keeps appearing, contact your original dealer or nearest authorized CASIO distributor to have 
the watch checked.
■ ERR appears on the display after I perform northerly calibration.
TheERR
 message indicates there may be some problem with the sensor. The ERR
 message also may 
be due to movement of the watch while the calibration procedure is being performed. Try performing 
calibration again, taking care to ensure that the watch is not moved.
If this does not solve the problem, the problem may be due to some nearby source of terrestrial 
magnetism. Try performing the calibration procedure again from the beginning.
Whenever you have a sensor malfunction, take the watch to your original dealer or nearest authorized 
CASIO distributor as soon as possible.
■ What causes incorrect direction readings?
• Incorrect bidirectional calibration. Perform bidirectional calibration (page E-37).• 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.
■ What causes different direction readings to produce different results at the same location?
Magnetism generated by nearby high-tension wires is interfering with detection of terrestrial magnetism. 
Move away from the high-tension wires and try again.
E-106
■ Why am I having problems taking direction readings indoors?
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 diffi cult inside ferro-concrete structures. Remember that you will 
not be able to take direction readings inside of trains, airplanes, etc.
■ The barometric pressure differential pointer does not appear on the display when I enter the 
Barometer/Thermometer Mode.
• This could indicate sensor error. Try pressing B
 again.• The barometric pressure differential pointer is not displayed when the displayed current barometric 
value is outside of the allowable measurement range (260 to 1,100 hPa).
World Time Mode
■ The time for my World Time City is off in the World Time Mode.
This could be due to incorrect switching between standard time and daylight saving time. See “To specify 
standard time or daylight saving time (DST) for a city” (page E-96) for more information.
Charging
■ The watch does not resume operation after I expose it to light.
This can happen after the power level drops to Level 5 (page E-10). Continue exposing the watch to light 
until the battery power indicator shows “H
” or “M
”.
Time Calibration Signal
The information in this section applies only when LIS
,LON
,MAD
,PAR
,ROM
,BER
,STO
,ATH
,MOW
,
HKG
,BJS
,HNL
,ANC
,YVR
,LAX
,YEA
,DEN
,MEX
,CHI
,NYC
,YHZ
,YYT
,TPE
,SEL
, or TYO
 is selected 
as the Home City. You need to adjust the current time manually when any other city is selected as the 
Home City.
E-107
■ The display shows the ERR indicator when I check the result of the latest receive operation.
Possible Cause Remedy Page• You are wearing or moving the 
watch, or performing a button 
operation during the signal 
receive operation.
• The watch is in an area with 
poor reception conditions.Keep the watch in an area where reception conditions are good 
while the signal receive operation is performed.E-16
You are in an area where signal 
reception is not possible for 
some reason.See “Approximate Reception Ranges”. E-15
The calibration signal is not 
being transmitted for some 
reason.
• Check the website of the organization that maintains the time 
calibration signal in your area for information about its down times.
• Try again later.–
■ The current time setting changes after I set it manually.
You may have the watch confi gured for Auto Receive of the time calibration signal (page E-17), which will 
cause the time to be adjusted automatically according to your currently selected Home City. If this results 
in the wrong time setting, check your Home City setting and correct it, if necessary (page E-28).
E-108
■ The current time setting is off by one hour.
Possible Cause Remedy Page
Signal reception on a day for 
switching between standard 
time/daylight saving time (DST) 
may have failed for some reason.Perform the operation under “To get ready for a receive operation”. 
The time setting will be adjusted automatically as soon as signal 
reception is successful.E-16
If you are unable to receive the time calibration signal, change the 
standard time/daylight saving time (DST) setting manually.E-30
■ Auto Receive is not performed or you cannot perform Manual Receive.
Possible Cause Remedy Page
The watch is not in the 
Timekeeping Mode or World 
Time Mode.Auto receive is performed only while the watch is in the Timekeeping 
Mode or World Time Mode. Switch to either of these two modes.E-24
Your Home City setting is wrong. Check your Home City setting and correct it, if necessary. E-28
There is not enough power for 
signal reception.Expose the watch to light to charge it. E-9
■ Signal reception is being performed successfully, but the time and/or day is wrong.
Possible Cause Remedy Page
Your Home City setting is wrong. Check your Home City setting and correct it, if necessary. E-28
The DST setting may be 
incorrect.Change the DST setting to Auto DST. E-28
E-109
Specifi cations
Accuracy at normal temperature:
 ±15 seconds a month (with no signal calibration)
Timekeeping:Hour, minutes, seconds, p.m. (P), year, month, day, day of the weekTime format: 12-hour and 24-hour
Calendar system: Full Auto-calendar pre-programmed from the year 2000 to 2099
Other: Two display formats (year screen, Tide Graph screen); Home City code (can be assigned one of 
48 city codes); Standard Time / Daylight Saving Time (summer time)
Time Calibration Signal Reception:
 Auto receive 6 times a day (5 times a day for the Chinese calibration 
signal) ; Remaining auto receives cancelled as soon as one is successful; Manual receive; 
Receive Mode
Receivable Time Calibration Signals: Mainfl ingen, Germany (Call Sign: DCF77, Frequency: 77.5 
kHz); Anthorn, England (Call Sign: MSF, Frequency: 60.0 kHz); Fort Collins, Colorado, the 
United States (Call Sign: WWVB, Frequency: 60.0 kHz); Fukushima, Japan (Call Sign: JJY, 
Frequency: 40.0 kHz); Fukuoka/Saga, Japan (Call Sign: JJY, Frequency: 60.0 kHz) ; Shangqiu 
City, Henan Province, China (Call Sign: BPC, Frequency: 68.5 kHz)
Digital Compass:
20 seconds continuous measurement; 16 directions; Angle value 0° to 359°; Four direction 
pointers; Calibration (bidirectional, northerly); Magnetic declination correction; Bearing Memory
Barometer:
Measurement and display range:
  260 to 1,100 hPa (or 7.65 to 32.45 inHg)
Display unit: 1 hPa (or 0.05 inHg)
Measurement timing: Daily from midnight, at two hour intervals (12 times per day); Every fi ve seconds 
in the Barometer/Thermometer Mode
Other: Calibration; Manual measurement (button operation); Barometric pressure graph; Barometric 
pressure differential pointer; Barometric pressure change indicator
E-110
Thermometer:
Measurement and display range: –10.0 to 60.0°C (or 14.0 to 140.0°F)
Display unit: 0.1°C (or 0.2°F)
Measurement timing: Every fi ve seconds in the Barometer/Thermometer Mode
Other: Calibration; Manual measurement (button operation)
Altimeter:
Measurement range: –700 to 10,000 m (or –2,300 to 32,800 ft.) without reference altitude
Display range: –10,000 to 10,000 m (or –32,800 to 32,800 ft.)
  Negative values can be caused by readings produced based on a reference altitude or due to 
atmospheric conditions.
Display unit: 5 m (or 20 ft.)
Current Altitude Data: 5-second intervals for 1 hour (0’05
), or 5-second interval for fi rst 3 minutes 
followed by 2-minute interval for next 24 hours (2’00
)
Altitude Memory Data:
Manually saved records: 14 (altitude, date, time)
Auto saved values: Two sets (memory areas) each of high altitude and its measurement date and 
time, low altitude and its measurement date and time, total ascent and its save start date and 
time, total descent and its save start date and time
Other: Reference altitude setting; Altitude differential; Altitude auto measurement method (0’05
 or 
2’00
)
Bearing Sensor Precision:
Direction: Within ±10°
  Values are guaranteed for a temperature range of –10°C to 40°C (14°F to 104°F).
North pointer: Within ±2 digital segments
E-111
Pressure Sensor Precision:Conditions (Altitude) Altimeter Barometer
Fixed
temperature0 to 6000 m
0 to 19680 ft.± (altitude differential × 2%
+ 15 m) m
± (altitude differential × 2%
+ 50 ft.) ft.± (pressure differential × 2%
+ 2 hPa) hPa
± (pressure differential × 2%
+ 0.059 inHg) inHg
6000 to 10000 m
19680 to 32800 ft.± (altitude differential × 2%
+ 25 m) m
± (altitude differential × 2%
+ 90 ft.) ft.
Effect of 
variable
temperature0 to 6000 m
0 to 19680 ft.± 50 m every 10°C
± 170 ft. every 50°F
± 5 hPa every 10°C
± 0.148 inHg every 50°F
6000 to 10000 m
19680 to 32800 ft.± 70 m every 10°C
± 230 ft. every 50°F
• Values are guaranteed for a temperature range of –10°C to 40°C (14°F to 104°F).• Precision is lessened by strong impact to either the watch or the sensor, and by temperature extremes.
Temperature Sensor Precision:
±2°C (±3.6°F) in range of –10°C to 60°C (14.0°F to 140.0°F)
Tide/Moon Data: 
Moon phase indicator for specifi c date; Moon age; Tide level for specifi c date and time
Other: High tide time adjustment; Moon phase reversal
Alarms:
 5 Daily alarms; Hourly time signal
Stopwatch:
Measuring unit: 1/100 second
Measuring capacity: 23:59' 59.99"
Measuring modes: Elapsed time, split time, two fi nishes 
						

							L-1
Operation Guide 3258
E-112
Countdown Timer:
Measuring unit: 1 second
Countdown range: 60 minutes
Setting ranges: Countdown start time (1 to 60 minutes, 1-minute increments); Reset time (1 to 5 
minutes, 1-minute increments)
Other: Progress beeper
World Time:
 48 cities (31 time zones)
Other: Daylight Saving Time/Standard Time
Illumination:
 EL Backlight (electro-luminescent panel); Selectable illumination duration (approximately 1.5 
seconds or 3 seconds); Auto Light Switch (Full Auto EL Light operates only in the dark)
Other:
 Battery power indicator; Power Saving; Low-temperature resistance (–10°C/14°F); Button 
operation tone on/off
Power Supply:
 Solar cell and one rechargeable battery
Approximate battery operating time: 5 months (from full charge to Level 4) under the following 
conditions:
• 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• 1 hour of altimeter measurement at 5-second interval, once per month• 2 hours of barometric pressure measurement per day• 4 minutes of signal reception per day
Frequent use of illumination runs down the battery. Particular care is required when using the auto 
light switch (page E-100).
L-2
City Code Table
City
CodeCityUTC Offset/
GMT Differential
PPG Pago Pago –11
HNL Honolulu –10
ANC Anchorage –9
YVR Vancouver
–8
LAX Los Angeles
YEA Edmonton
–7
DEN Denver
MEX Mexico City
–6
CHI Chicago
NYC New York –5
SCL Santiago
–4
YHZ Halifax
YYT St. Johns –3.5
RIO Rio De Janeiro –3
FENFernando de 
Noronha–2
RAI Praia –1City
CodeCityUTC Offset/
GMT Differential
UTC
0 LIS Lisbon
LON London
MAD Madrid
+1 PAR Paris
ROM Rome
BER Berlin
STO Stockholm
ATH Athens
+2 CAI Cairo
JRS Jerusalem
MOW Moscow
+3
JED Jeddah
THR Tehran +3.5
DXB Dubai +4
KBL Kabul +4.5
KHI Karachi +5
L-3 City
CodeCityUTC Offset/
GMT Differential
DEL Delhi +5.5
KTM Kathmandu +5.75
DAC Dhaka +6
RGN Yangon +6.5
BKK Bangkok +7
SIN Singapore
+8 HKG Hong Kong
BJS Beijing
TPE Taipei
SEL Seoul
+9
TYO Tokyo
ADL Adelaide +9.5
GUM Guam
+10
SYD Sydney
NOU Noumea +11
WLG Wellington +12
• Based on data as of July 2010.• The rules governing global times (GMT 
differential and UTC offset) and summer time 
are determined by each individual country.