[thegrasshopper2]

I just tried to disable every "augmented navigation" and use GPS only.

Everything works, it's just a bit more annoying because it takes more time to get the location. If I press the "current location" button before that I'm prompted to activate augmented location, if I wait a bit google maps successfully finds my position on the map.

Trying to navigate brings the annoying pop-up again (every time I close/open the screen, actually), but clicking OK and then reverting manually keeps the navigation open.

I live in Europe, so that might be a reason for the difference, anyway I can suggest OpenStreetMaps as a good alternative (superior to gmaps at times too).