I believe these two articles help to get an understanding how mapping actually works From David Pogue,NY Times http://goo.gl/HTuuu while Alexis C. Madrigal of the Atlantic goes into more technical details http://goo.gl/Y0ENU I am not interested in turn-by-turn directions, I know where I want to end up. BKK is of no interest, would never ride/drive there. What I love about my Andriod Google maps that I can, opposed to a conventional GPS, look what is behind the next mountain, can see the terrain, cluster of buildings, and many more details. Much easier to visualize a house to be rented/ build here and there. What is your view?