Are you looking for an Online Street Map of Japan in English?
Here is the website to visit.
I think this is the best street map of Japan. It is simple. It has both Japanese and English names. How nice! But it's just too bad that it won't navigate you to the places you want to go. But still, graphic is the best. It is really simple. You know, when there is too much name of that land mark written, it get more complicated? This is why I recommend this OpenStereetMap Japan.
It is pretty fun to see how long the road you use in daily continues. Looking up how long rout 1 goes and stuff.
OpenStereetMap Japan
http://www.openstreetmap.jp/
