I now have all PNG turned off except the three mentioned in post #19 for controlling the autopilot.
I do not know what the RDS SENDER NMEAD sensor is. Not even a good guess. I do have a RD-33 on the can bus but it is almost always turned off, including today.
I have changed the preferred sensors as to as described in posts 16 on EXCEPT when I open the sensor dropdown list for TWA/TWD/TWS there is no sensor available except Navpilot-700. FI-501 is not a choice!
I changed FI-503 to instance number 001 but when I rebooted the plotter it was back to instance number 000. Not sure how to handle that.
None of these changes helped with the BTW and CTS problem. I am wondering if that problem is due to something the autopilot should be outputting but is not?
We are at anchor today so no info on if any change to the VMG behavior.