Why does the AVR clock display a flashing letter G?
This happens when the AVR clock determines that its time and/or date is different from the time/date obtained from the NMEA output of a GPS device connected to the Serial Port (and the GPS option is selected with the proper local time zone offset). The AVR clock will update its time (and the on board Real Time Clock) to the time/date obtained from the GPS device and will display a flashing letter “G” for 5 seconds.
