Actually, just tap the physical "Maps" button below the screen and you can use the built in navigation. You cannot use the voice commands though, as you noted.Yes. I have the Subaru navigation and when I plug the phone in I no longer have the Tomtom navigation, Google Maps starts I can no longer use the Subaru voice commands as the Android Auto takes preference.
go to your settings on your phone. Open apps find android auto do a force stop then look for the button to disable it. This works I was having the same problem.I really don't like Android Auto, but want to have the capability of using it for Google Maps when needed. All I really want to do is charge my phone.
I know I can't use the bottom one of the two for Map Updates via USB.Both front USB ports connect to the head unit for phone or digital data. I use one for my phone, and one for my USB thumb drive. A true charge only cord will prevent data from phone to head unit. A data blocker dongle/device will also do the same.