Hi Just about finished a Trutrak install in a C182P and working with the engineers who have hit an issue today. There is already a G5 AI and GTN650 with ver 6.50 in the plane. The G5 requires the GTN ARINC 429 out to be set to Data=GARMIN 429 for s/w ver 6.50+ in order for it to to display the GTN VNAV function (which is nice). However the TruTrak wants GAMA 1 and won't work with GARMIN 429.We tried using the GTN ARINC429 channel 2 -the next-door pin-outs but the config page greys out GAMA -apparently you can't have two channels with GAMA. It's starting to look like I'm forced to go backwards to no VNAV on the G5 in order to get the TruTrak to follow the GPS. Disappointing! We'll look again tomorrow at the Garmin install manuals but assume someone has already hit this problem?