G-Shock GW-1800DJ-1A9 - Manual (Page 21)

E-20
• Signal reception may not be possible at the distances that are further than those
noted below during certain times of the year or day. Radio interference also may
cause problems with reception.
Fort Collins (United States) transmitter: 600 miles (1,000 kilometers)
Fukushima or Fukuoka/Saga (Japan) transmitters: 500 kilometers (310 miles)
• Even when the watch is within the reception range of the transmitter, signal
reception will be impossible if the signal is blocked by mountains or other geological
formations between the watch and signal source.
• Signal reception is affected by weather, atmospheric conditions, and seasonal
changes.
About Auto Receive
With Auto Receive, the watch performs the receive operation each day automatically
up to six times between the hours of midnight and 5 a.m. (according to the
Timekeeping Mode time). When any receive operation is successful, none of the other
receive operations for that day are performed.