what do you do when you hit gravel covered asphalt?
lots of things !!!
sometimes its a hoot to spin up the back
slide the rear
feel the front drift back to traction
sometimes I fall down.
no big deal, the bike knows what pavement, dirt, trees, grass, mud, gravel, and lots of other surfaces look like from many different angles. hell it doesn't even close its eyes or tense up anymore.
Yes, Android AND iphone GPS works without cellular data. Use offline maps and enjoy. (thanks drtbyk!)