If you want to use navigation you would need to be in Europe if you are running sw 0360. The patched US DVD doesn't work with 0330 or newer. The Euro 2005_2 DVD contains 0360, Euro 2005_1 contains 0330.
I doubt that you could downgrade your SW that easy.
To do that you would need to flash chip to clear software completly (or use any other method if available) and then load new software. To much work and not everyone can do it.
I this the only possibility is to wait for new softweare and check then.