I used this app many times daily to navigate my way around. From Hakone to the west to downtown Tokyo to Narita airport. From route planning to navigation, this app was very helpful. If you are going to tour about Tokyo by train, you must get this app. All the trains are colour coded and the line colours reflect that on the rail map. Choose your stations and the route is highlighted for you AND you can see where you are at all times with the track feature. There is also a highly detailed city map you can use with the search function. Id give a five if it had a rail line highlight feature that would lift the line from the map while slightly fading the background and some primer notes detailing the colour codes and the rapid trains etc. Minor complaints really, I highly recommend it.
Philippe426 about City Rail Map - Travel Offline, v5.0.3