Google Maps isn't that mobile.
Dupont Circle CVS, waiting in line behind a 20-something guy and 20-something woman. They were talking about where they were going next.
Guy: "Do you know how to get there?"
Girl: "Yeah. I mean, I know where it is. I don't have a direct route planned or anything. We'll find it."
Girl: "Hey, this isn't Google Maps up here (pointing to her head)"