Google maps and nav is 10X better than what is in the Model S (Navigon, iirc). For example, Google Nav updates travel time based on traffic conditions, Tesla Nav does not. I was driving down town during rush hour and TN said 12 minutes while GN said 35. It was very close to 35 minutes to get there. GN is also getting realtime updates for alternate routes and incident reports. I love the idea of being able divert around an accident caused backup.After seeing the new google maps on my Android device, I sure wish they could work something out to use it. Combine it with google now and everything you do or search on your computer or phone would be right on their in your car. Man that would be nice.
What would be even better if they allowed you to have your google account tied to your car user identity. Then addresses dropped into calendar or email would be directly usable in nav. As it is now, I either use GN on my phone or have to transcribe the address into TN (how 1990s). Maybe Tesla doesn't want to tie themselves too tightly to Google but it would definitely be awesome.