I just did some training last weekend and worked with a guy that has the same system in his airplane. (Big shout out to @mike_elliott and his guys for a great session). One thing that has still yet to be resolved is the VNAV function on my autopilot. We simply could not get the VNAV to arm on the autopilot head.   Quick Reference of my setup: -Dual G5's -GTN650 xi -GFC500 Autopilot   -I have "VNAV Enabled" turned ON in the GTN box -I have set the lowest altitude o