Ok, I just bought a 2016 Buick Enclave (used... it was a random car in a Ford lot and I wasn't really looking for this car but saw it and it was sharp so I bought it...). It has a touchsceeen and Onstar. I have a trial of onstar and it has turn-by-turn navigation. I can either push the blue button and ask the rep to give me directions, or send the destination from my onstar app on the phone. Once the destination is there, it shows me in the lower right of my screen the next intersection and navigates me with how far to the intersection. So, it's does seem the navigation is built into the screen. But it doesn't show a map like a traditional navigation system. Is there a feature I haven't found yet to turn on the full screen map?