I just upgraded from GNS 530 + 430 to a GTN 750. I have a KAP 225 auto pilot. When plotting a Direct To course with the GPS and then pressing the NAV button on the auto pilot, nothing happens. I can get the NAV button to work when I use the VLOC to see a VOR or ILS freq, but not in GPS mode. If I want to fly a GPS route, then I use the Heading Bug and select HDG on the auto pilot and self-correct for wind/drift. Sarasota Avionics is where the work was done and they are talking with Garmin to troubleshoot.
Has anyone come across this situation before?