Operation Guide 3184
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 (AvtA) 
DST off (OFF) 
DST on (ON)
DST indicator
| • If you change your Home City to one that is within the |
| same transmitter area, the current DST setting (Auto |
| DST) will be retained. If you change to a city that is |
| outside your current transmitter area, DST will be |
| turned off automatically. |
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Transmitter | Covered City Codes |
Japan | TPE, SEL, TYO |
China | HKG, BJS |
U.S. | HNL, ANC, YVR, LAX, YEA, DEN, MEX, CHI, NYC, YHZ, YYT |
Europe (U.K., Germany) | LIS, LON, MAD, PAR, ROM, BER, STO, ATH, MOW |
None | All other city codes |
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.
Moon Phase Indicator
The Moon phase indicator of this watch indicates the
Moon Phase indicator | current phase of the Moon as shown below. It is based on | ||||||||||||
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| the actual Moon as viewed from your location, you can | ||||||||||
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Moon Phase |
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Moon Age |
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Moon Phase |
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Moon Phase |
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Indicator |
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Moon Age |
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Moon Phase |
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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 specified by you.
Tide Graph
The 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 |
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Spring Tide |
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| Moon. |
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Intermediate Tide |
| Medium difference between high tide |
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Neap Tide |
| Small difference between high tide |
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•The Tide Graph flashes as shown below to indicate the tide range.
Low tide
High tide | High tide |
•The segments on either end of the Tide Graph flash during high tide.
Button Operation Tone
Mute indicator | The button operation tone sounds any time you press one | |||||||
of the watch’s buttons. You can turn the button operation | ||||||||
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| tone on or off as desired. |
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| • Even if you turn off the button operation tone, alarms, | |||||
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To turn the button operation tone on and off |
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| 1. In the Timekeeping Mode, hold down A until the city | |||||
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| 2. Press C nine times until the current button operation | |||||
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| tone setting ( | or | ) appears. |
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| 3. Press D to toggle the setting between | (tone on) | ||||
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| 4. Press A to exit the setting screen. |
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•The mute indicator is displayed in all modes when the button operation tone is turned off.
Power Saving Function
When turned on, the Power Saving function enters a sleep state automatically whenever the watch is left in an area for a certain period where it is dark. The table below shows how watch functions are affected by the Power Saving function.
Power saving indicator
Elapsed Time | Display | Operation |
in Dark |
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60 to 70 minutes | Blank, with Power Saving | All functions enabled, except for the |
| indicator flashing | display |
6 or 7 days | Blank, with Power Saving | Auto receive, beeper tone, |
| indicator not flashing | illumination, and display are disabled. |
•Wearing the watch inside the sleeve of clothing can cause it to enter the sleep state.
•The watch will not enter the sleep state between 6:00 AM and 9:59 PM. If the watch is already in the sleep state when 6:00 AM arrives, however, it will remain in the sleep state.
•The watch will not enter a sleep state while in the Diving Mode, Stopwatch Mode, or Countdown Timer Mode.
To recover from the sleep state
Perform any one of the following operations.
•Move the watch to a
•Press any button.
•Angle the watch towards your face for reading.
To turn Power Saving on and off
1. In the Timekeeping Mode, hold down A until the city code starts to flash, which indicates the setting screen.
2. Press C 11 times until the Power Saving on/off screen
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| l | 3. Press D to toggle Power Saving on ( ) and off ( | ). | |||
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| l l | ll | l | • The Power Saving indicator is on the display in all |
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Radio-controlled Atomic Timekeeping Precautions
•Strong electrostatic charge can result in the wrong time being set.
•The time calibration signal bounces off the ionosphere. Because of this, such factors as changes in the reflectivity of the ionosphere, as well as movement of the ionosphere to higher altitudes due to seasonal atmospheric changes or the time of day may change the reception range of the signal and make reception temporarily impossible.
•Even if the time calibration signal is received properly, certain conditions can cause the time setting to be off by up to one second.
•The current time setting in accordance with the time calibration signal takes priority over any time settings you make manually.
•The watch is designed to update the date and day of the week automatically for the period January 1, 2000 to December 31, 2099. Setting of the date by the time calibration signal cannot be performed starting from January 1, 2100.
•This watch can receive signals that differentiate between leap years and
•Though this watch is designed to receive both time data (hour, minutes, seconds) and date data (year, month, day), certain signal conditions can limit reception to time data only.
•If you are in an area where proper time calibration signal reception is impossible, the watch keeps the time with the precision noted in “Specifications”.
•If you have problems with proper time calibration signal reception or if the time setting is wrong after signal reception, check your current city code, DST (summer time), and auto receive settings.
•The Home City setting reverts to the initial default of TYO (Tokyo) whenever the battery power level drops to Level 5 or when you have the rechargeable battery replaced. If this happens, change the Home City to the setting you want.
Transmitters
The time calibration signal received by this watch depends on the currently selected Home City code.
•When a U.S. time zone is selected, the watch receives the time calibration signal transmitted from the United States (Fort Collins).
•When a Japanese time zone is selected, the watch receives the time calibration signals transmitted from Japan (Fukushima and Fukuoka/Saga).
•When a European time zone is selected, the watch receives the time calibration signals transmitted from Germany (Mainflingen) and England (Anthorn).
•When a China time zone is selected, the watch receives the time calibration signal transmitted from China (Shangqiu City).
•When your Home City is LIS, LON, MAD, PAR, ROM, BER, STO, ATH, or MOW (which can receive both the Anthorn and Mainflingen signals), the watch first tries to pick up the signal it last successfully received. If that fails, it tries the other signal. For the first receive after you select your Home City, the watch tries the nearest signal first (Anthorn for LIS, LON, Mainflingen for MAD, PAR, ROM, BER, STO, ATH, and
MOW).
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