This on-wrist navigation system uses Google Maps and something called… paper. This is a throwback to scroll-based directions from the 1920′s and 30′s that [Simon] built. He soldered a couple of brass tubes to a brass back plate, then added sides and a face crystal. Now he prints out step by step direction from the popular mapping website and winds them onto scrolls. We’re not sure that we’d take the time to do this, but hey, at least the screen resolution is fantastic and you don’t have to worry about battery life.