I tried that method and payed dearly for them and now I have 3 US Garmin's in a drawer that I don't use from trying that UUD map. If you want you can have those maps for free just contact me. They are junk.
The bad part about them is they will steer you down the wrong road every now and them causing you to make a detour for an hour or more.
I recommend you take a look at the Japanese Garmin's, they speak in English and the accuracy is spot on. The have telephone search, address search and a few hundred saved favorites pre-loaded already like all the places you want to go.
Here's a link:
BestGPSforJapan.freeforums.org • Index page