Hi all,
Our Garmin units still use completely stock autopilot, nav, and flight plan systems. So any issues you are seeing with ILS or RNAV approaches are going to be sim related.
As we work this year on moving our units into the sim, we will also be working on bringing the same improvements in those areas that we made on the CJ4 into the sim as well, so everything can have the same navigational accuracy.
-Matt