A very handy and affordable navigation system for Japan driving – easy to set up, low cost (around 30,000 yen), very accurate directions, English voice over. Note: You still need to be able to read Japanese in order to input addresses into the system.
Available at most large electronic stores – as I said above the cost is about 30,000 yen.
This particular model says it is Android compatible (sorry I do not have an Android phone/tablet to test it).
See the video here – CLICK HERE