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FAQs on ASTRON

Is the watch sufficiently recharged?
GPS signal reception consumes a lot of energy. Remember to recharge the watch by exposing it to light so that the indicator hand points to the "level position (middle)" or "F (full)."

Is the watch receiving the GPS signals?
Please check whether the reception result of the last GPS signal reception was successful or not.

How to use

Troubleshooting

How to use

Where can I receive the GPS signals? Where can I not?

GPS signals can be easily received under the open sky with good visibility. The less exposure to the sky, the more difficult it is to receive GPS signals. In addition, reception will also be difficult in places where there are objects or buildings that obstruct the GPS signals, particularly during "time zone adjustment". Furthermore, alignment of satellites, weather conditions or the sun’s turbulence can affect reception condition temporarily. Examples of places and conditions as are follows:

Easy to get reception:
  • - Outdoors under an open sky with good visibility
Difficult to get reception:
  • - Between tall buildings
  • - Near wooded areas
  • - At Stations / Airports
  • - Indoors with windows
No reception:
  • - Indoors without windows
  • - Underground
  • - While passing through tunnels
  • - Through special glass with thermal emission shield effect, etc.
  • - Close to equipment that is generating noise or performing wireless communications

Does ASTRON adjust time automatically? (Does it receive GPS signal automatically?)

Yes, ASTRON is equipped with "automatic time adjustment" function. The watch will automatically receive GPS signals and set itself to the precise current time of the currently set time zone once a day. The automatic time adjustment is performed when the watch is exposed to bright light outdoors under an open sky where GPS signals reception is good. For this time adjustment to take place however, it is essential for the watch to have sufficient charge.

Please note that the automatic time adjustment will not be performed when the watch is concealed under a sleeve and the dial is not exposed to sufficient light, even outdoors under an open sky. In this case, the watch records the time of the previous successful manual time adjustment (or time zone adjustment), and automatically starts time adjustment at the recorded time.

How do I adjust time manually? (How do I receive GPS signals manually?)

When the watch is in an environment where it is unable to receive GPS signals for an extended period, you can adjust to the precise current time by receiving the signal manually. By performing a manual time adjustment, the watch will display the precise time of the currently set time zone. Please note that successfully receiving the the GPS signal depends on the reception environment.

How to perform manual time adjustment:
  • 1. Make sure you are in a place where it is easy to get GPS signal reception.
  • 2. Press Button B (at 2 o’clock position) for 3 seconds, and then release it when the second hand moves to the 0-second position.
  • 3. Hold the watch with the face upward and wait for the watch to complete reception.
  • 4. The reception is competed successfully when the second hand points to "Y" (at 12-second position). Please note, the reception may take maximum time of one minute.
  • 5. If the second hand points to "N" (at 18-second position), please try again outdoors under an open sky.

How do I adjust to local time after crossing into a different a time zone?

The watch can identify the time zone of its present location and adjust to local time by manually receiving the GPS signals. This adjustment can be made by performing a button operation.

Please note that the time of the sub-dial will not change along with the time of the dial, because the sub-dial moves independently of the dial. The sub-dial will display the precise home time (the time before performing time zone adjustment), unless the user changes it manually.

How to perform time zone adjustment:
  • 1. Make sure you are in a place where it is easy to get GPS signal reception.
  • 2. Press Button B (at 2 o’clock position) for 6 seconds, and then release it when the second hand moves to the 30-second position.
  • 3. Hold the watch with the face upward and wait for the watch to complete reception. During reception, the second hand will move and stop at several positions.
  • 4. The reception is completed successfully when the second hand points to "Y" (at 12-second position).
  • 5. If the second hand points to "N" (at 18-second position), please try again outdoors under an open sky.

In locations where GPS signals cannot be received, the time zone can be changed manually by button operation. Please refer to pg. 20 "Manual time zone setting" in the instruction manual for the details of the procedure.

Does the sub-dial also receive GPS signals?

The dual time displayed by a sub-dial also keeps accurate time by using GPS signal reception. When the watch receives GPS signals, the time of the sub-dial is also adjusted.

However, since the sub-dial is designed to display the home time of the user, it will not adjust to local time even when the user performs time zone adjustment. The sub-dial will keep the precise home time unless the user changes it manually.

Respective times of two regions can be displayed by the dial and sub-dial.
Example: Honolulu time and Japan time are respectively displayed by the dial and sub-dial.

What should I do when boarding on a plane with ASTRON?

In order to avoid any interference with the operation of electronic devices in an airplane, please set the watch to the in-flight mode when boarding a plane. In the in-flight mode, the GPS signal reception function (time zone adjustment, manual time adjustment, and automatic time adjustment) will not work.

How to set ASTRON to the in-flight mode:
  • 1. Press Button B (at 2 o’clock position) and release it.
  • 2. Within approximately 5 seconds after pressing Button B, press Button C (at 4 o’clock position) for 3 seconds. The second hand will stop at the 40-second position, and the indicator hand will point to the"airplane mark."
  • 3. The watch is now set to the In-flight mode, and it will return to the normal time display after 5 seconds.

How do I turn ON / OFF Daylight Saving Time?

Daylight Saving Time (DST) is individually set by the users depending on the area of residence. DST means "summer time," which is a system to lengthen daylight hours by advancing 1 hour when days are longer in summer. Currently, DST has been adopted in Europe and North America, and the adoption and duration vary depending on the country.

How to turn ON Daylight Saving Time:
  • 1. Press Button A (at 10 o’clock position) once and then release it. The indicator hand will move to indicate the current DST setting ("ON" or "OFF").
  • 2. Press Button C (at 4 o’clock position) for 3 seconds within 5 seconds after step 1.
  • 3. The indicator hand will move and point to “ON,” and the hour and minute hands will advance by one hour.
  • 4. The DST is turned ON when the hands stop moving, and the watch returns to the normal time display.
How to turn OFF Daylight Saving Time:
  • 1. Press Button A (at 10 o’clock position) once and then release it. The indicator hand will move to indicate the current DST setting ("ON" or "OFF").
  • 2. Press Button C (at 4 o’clock position) for 3 seconds within 5 seconds of step 1.
  • 3. The indicator hand will move and point to “OFF,” and the hour and minute hands will turn back one hour.
  • 4. The DST is turned OFF when the hands stop moving, and the watch returns to the normal time display.

What should I do when an indicator hand is pointing at "E"?

This indicates that the charging status of the watch is low. When the charging status is displayed as “E,” the watch is unable to receive the GPS signals even when the user performs manual GPS signal reception. Since GPS signal reception consumes a lot of energy, please remember to charge the watch on regular basis. To ensure optimal performance of the watch, it is advisable to have the indicator hand pointed to “F (full)” or in between "F" and "E (empty)" at all times.

What should I do when a second hand is moving in two-second / five-second intervals?

This is a sign that the charging status of the watch is very low. The watch is unable to receive the GPS signals, and does not have sufficient energy to operate. Please recharge the watch until the second hand starts moving at 1-second intervals and the indicator hand points to “F (full)” or in between "F" and "E (empty)."

If the second hand starts moving at 2 or 5-second intervals even when the user wears the watch everyday, the watch may not be receiving sufficient light. For instance, the watch may be concealed under a long sleeve shirt and is not adequately exposed to light. In this case, try to place the watch in an environment where it will be exposed to light when not being worn.

What should I do when I get lost in middle of an operation?

When the crown is pushed in:
  • 1. Press Button A (at 10 o’clock position) and release it to return to the standard time display.
  • 2. The second hand will start moving normally within 2 minutes.
  • 3. Start the operation again from the beginning.
When the crown is pulled out:
  • 1. Push the crown back in, and wait for the second hand to start moving. It will start moving within 9 minutes.
  • 2. Start the operation again from the beginning.

How do I set the sub-dial?

The sub-dial is designed to display the home time of the user, it will not adjust to local time even when the user performs time zone adjustment. The sub-dial will keep the precise home time unless the user changes it manually.

How to set the sub-dial:
  • 1. Turn the crown counterclockwise (downward) to unlock the crown.
  • 2. Pull out the crown to the first click. The watch enters the time setting mode of the sub-dial.
  • 3. Press Button B (at 2 o’clock position) or Button C (at 4 o’clock position) to set the time.
  • 4. Push the crown back in when the operation has been completed.
  • 5. Turn the crown clockwise (upward) while gently pressing it in toward the watch body until it stops.

* The sub-dial displays the time in a 24-hour system.

How do I adjust the preliminary position of the date, indicator hand, and hour / minute hands?

  • 1. Press and hold Button B (at 2 o’clock position) and C (at 4 o’clock position) simultaneously (3 seconds), and then release them when the second hand moves to the 13-second position. The watch enters the mode for adjustment of the preliminary position of the date. The date moves, and stops at the preliminary position.
  • 2. Press Button B or C to set the date to “1.”
  • 3. Press and hold Button A (at 10 o’clock position) for 2 seconds and release it when the second hand moves to the 55-second position. The watch enters the mode for adjustment of the preliminary position of the indicator hand.
  • 4. Press Button B or C to adjust the indicator hand to the middle of “E” (low) and airplane mark.
  • 5. Press and hold Button A (2 seconds) and release it when the second hand moves to the 0-second position. The watch enters the mode for adjustment of the preliminary position of the hour / minute hands.
  • 6. Press Button B once and then release it. The hour / minute hands move and stop at “00:00 am.”
  • 7. When the operation is completed, press Button A and release it. The mode for adjustment of the preliminary position is terminated, and the second hand and the hour / minute hands start moving.

* If no operation is performed for more than 1 minute or when Button A is pressed once, the watch returns to the time display mode. When the watch has returned to the time display mode, restart the operation.

Other Questions

Troubleshooting

How do I check whether the last GPS signal reception was successful or not?

  • 1. Press Button B (at 2 o’clock position) once and then release it. The second hand and indicator hand will display the reception result for 5 seconds.
  • 2. Check the position of hands.
    The second hand at "Y 12-second position" and indicator hand at "1" → Time adjustment was successful.
    The second hand at "Y 12-second position" and indicator hand at "4+" → Time zone adjustment was successful.
    The second hand at "N 18-second position" → Reception was unsuccessful.
    The second hand in between 0 to 18-second position and indicator hand at the right side of "4+" →
    Currently waiting for reception of leap second data. It is recommended you move to a place where it is easy to get GPS signal reception.

What should I do when the watch does not display the correct time?

Please check the following points:
  • 1. The last GPS signal reception result: The time adjustment / time zone adjustment may not have been successful. If reception was unsuccessful, please move to a place where it is easy to get a GPS signal reception.
  • 2. The Daylight Saving Time (DST) setting: The DST setting may not correspond to the current implementation status of DST.
  • 3. In-flight mode setting: If the in-flight mode is set, please reset it and perform the manual time adjustment function.

What should I do when the watch does not adjust the time zone setting?

Please check the following:
  • 1. The last GPS signal reception result: The time adjustment / time zone adjustment may not have been successful. If reception was unsuccessful, please move to a place where it is easy to get a GPS signal reception or set the time zone manually.
  • 2. In-flight mode setting: If the in-flight mode is set, please reset it and perform the manual time adjustment function.
  • 3. The charging status: The watch cannot receive GPS signals when the charging status is at “E (low).” Please recharge the watch until the indicator hand points to the “level position (middle)” or “F (full).”

What should I do when the watch is unable to display the precise time or date even though the result of the last GPS signal reception was successful?

The preliminary position may be misaligned due to a strong impact or magnetism. For detailed procedures, please refer to How do I adjust the preliminary position of the date, indicator hand, and hour / minute hands?

What is happening when the indicator hand is pointing to the right side of "4+"?

The automatic leap second reception function has been activated. The indicator hand points to the right side of "4+" when GPS signals are received (time zone adjustment or time adjustment) around June or December. This indicates that the watch is ready for leap second data reception or receiving leap second data. At this time, the second hand points to any of the 0 to 18-second positions to indicate the waiting time in minutes until leap second data reception. The waiting time decreases each minute, and when the second hand points to the 0-second position, the leap second data reception begins. It is recommended you move to a place where it is easy to get a GPS signal reception.

* This function activates every time the watch receives GPS signals until it successfully receives leap second data.

What should I do when the indicator hand is misaligned?

The preliminary position of the indicator hand may be misaligned. This occurs when the preliminary position of the indicator hand is misaligned due to external factors or system reset. Please adjust the premilinary position of the indicator to the correct position (the middle of “E” and "airplane mark").

What should I do when the hands are not moving even after recharging?

The preliminary position of the indicator hand may be misaligned and displaying charging status other than "E (low)" even though the charging status is actually low. Please adjust the premilinary position of the indicator to the correct position (the middle of “E” and "airplane mark") and check the charging status again. If the indicator hand displays "E," recharge the watch.

What should I do after resetting the system (built-in IC)?

Resetting the system is not recommended. If you do reset the system, please go through the following procedures before usage, because the watch returns to the initial state after the system is reset.

After resetting the system (built-in IC):
  • 1. Make sure the watch is sufficiently charged until the indicator hand displays “F (full)” or in between "F" and "E (empty)."
  • 2. Adjust the preliminary position of the date and indicator hand. The hour / minute / second hand does not need to be adjusted, since the automatic hand position alignment function will activate.
  • 3. Adjust the hands of the sub-dial.
  • 4. Set to the correct time zone setting.
  • 5. Successfully receive the leap second data. (The leap second reception function activates when GPS signals are received after the system is reset. )

Other Questions

For further detailed information, please refer to the "Basic operations" or "Troubleshooting" (pg. 42-55) sections on the Complete User Guide for GPS Solar watch.

ASTRON instruction manual

If you cannot find an answer to your question in the instruction manual, please contact the Authorized Seiko Service Center.