I've been trying unsuccessfully to get the GTN 750 to work with the Phenom 300.

The unit starts up ok and I can even setup a flight plan when I try to hit 'nav' on the autopilot nothing happens.

Also waypoint info is not displaying on the PFD which is probably why the 'nav' issue is happening.

 

I've gotten the 750 to work with other aircraft but not this one. 

Am I doing something wrong here?

 

I got it to work by uninstalling the Navigraph Extension pack and then resetting up the GTN. 

Works great now.