Casio 3145 Manual page 27

About the Signal Indicator
The signal indicator shows the strength of the calibration signal being
received. For best reception, be sure to keep the watch in a location where
signal strength is strongest. The signal indicator is displayed while an auto or
manual receive operation is in progress.
Signal indicator
• Even in an area where signal strength is strong, it takes about 10 seconds
for signal reception to stabilize enough for the signal indicator to indicate
signal strength.
Weak Strong
(Level 3)
E-25