I have a number of these Casio and Citizen watches. This watch does not use GPS for the time keeping. It uses a land based broadcast time signal. There is public information about where the signals come from for your area. The technical breakdown of the time code signal is public access information.
The instruction manual of the watch has the information about when your watch should automatically receive the time signal, and how to set up the watch. Many of the manuals also included a map showing the time signal coverage, and includes the time of day information to show when the signal is strongest.
Make sure the watch settings are for your time zone. This is important. If the main time zone is not for your area it will be trying to receive the signal at the wrong frequency at the wrong time of day. There are areas where the signal may not be able to be received. You can get the mapping for this from the service that the watch has been set to use.
In North America the auto time receive is supposed to take place between midnight 00:00 to 04:00. In the eastern part of North America the reception is poor compared to central and western part of North America. Check the instruction manual for your watch for details.
Below is the spec listing of your watch.
- Atomic Timekeeping
Receives time calibration radio signals which keep the displayed time accurate
Auto receive function (3 times per day)
Manual receive function
Signal: WWVB, UK MSF Frequency: 60kHz
- 50M Water Resistant
- EL Backlight with Afterglow
- World Time
29 times zones (30 cities), city code display, daylight saving auto/on/off
- Date Alert
Display flashes when set date is reached
- 4 Daily Alarms and 1 Snooze Alarm
- 1/100 second digital stopwatch
Measuring capacity: 99:59'59.99"
Measuring modes: Elapsed time, lap time, split time, 1st-2nd place times
- Hourly Time Signal
- Auto Calendar (pre-programmed until the year 2039)
- 12/24 Hour Formats
- Accuracy: +/-20 seconds per month (with no signal calibration)
- Battery CR1620
- Approx. battery life: 2 years
- Module 2556
Size of case / total weight
WV57 47.0 x 39.0 x 12.5mm / 44g
WV57HD 47.0 x 39.0 x 12.5mm / 89g