Actually pretty good
Ive never been to Tokyo before, and I found this quite useful. There is no navigation, but the maps are quite accurate, and its easy to plot out your course using the phones GPS. You can locate and save locations to an easily accessible list, and make multiple lists. Free wifi is VERY limited in Tokyo (Starbucks is your friend!) so this was essential. One caveat, using it to navigate for prolonged periods is obviously a rapid power drain. My strategy has been to use this app, google maps when I have wifi, and a good paper map to reduce power consumption. Add street names, and Ill add a star.
Chairmanstein about
Tokyo Travel Guide and Map, v8.3.1