Module No. 5625

Signal Reception Precautions

  • When the watch is unable to adjust its time in accordance with a calibration signal for some reason, average timekeeping accuracy is within ±15 seconds per month.
  • Note that an internal decoding process the watch performs after it receives a signal may cause the time setting to be slightly off (by less than one second).
  • Time calibration signal reception is not possible under the conditions described below.
  • While battery power is low
  • In any mode besides the Calendar Mode
  • While the watch is at Level 3 power saving
  • While the crown is pulled out
  • While a timer countdown operation is in progress
  • While the Home City setting is a time zone where time signal reception is not possible
  • While the watch is outside the time signal reception range
  • While the Airplane Mode is enabled
  • When the receive operation is successful, the time and/or day settings will be adjusted automatically. Summer time will not be applied correctly in the case described below.
  • When the summer time start date and time, end date and time, or other rules are changed by authorities
  • If your watch is connected with a phone, settings must be configured so CASIO WATCHES can acquire location information. Even if you are in an area that is within the reception range of a time signal, reception will not be performed if settings are configured in a way that makes signal reception impossible.
  • As of January 2020, China does not observe summer time. If China starts to observe summer time in the future, the time displayed by the watch for China may not be correct.