Time/Date jumping around

[Chuck - Raymarine - Moderator]

I suspect that the system is receiving GPS data from a NMEA 0183 source or possibly one of the devices using NMEA 0183 communications is looping received data back into the system. With respect to the AIS650, it should only be interfaced to the system via its SeaTalkng communications interface. A common mistake made by AIS650/500 owners is that they enable the output of GNSS sentences via the ProAIS2/ProAIS software. Again, attaching a system diagram to this thread may permit us to identify the source of the problem.