This kind of thing probably works well in major markets. Last time I used google naviation it took me to a vacant lot half a mile from where I wanted to go. Another time it took me on a convoluted route that included cutting through two private apartment parking lots for a destination that turned out to be literally around the corner and down the road from where I started. This is not uncommon in my part of the US (midwest). I don't use navigation anymore, I look at the maps and pick my own routes.