I am new here, I was looking for info on the GPS for my PSP, I emailed the company that makes the Japaneese version and this is what they said:
"Thank you very much for coming into contact with us.
We're afraid that we've got no plan to apply on maps abroad for the moment.
However, we'll refer it for developments of a product to release in the near future.
Please keep your favours toward our products from now on.
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MAPLUS PORTABLE NAVI Information Centre
URL：
http://maplus-navi.jp/
E-mail:
info@maplus-navi.jp
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"