The Nokia N900 has already available a loader of Ovi Maps. Solved some problems that had with the desktop application Ovi Suite to download the maps.
With Ovi Maps Loader we can download directly on the Nokia N900 maps to use the GPS, and not have to use the data connection of our N900. But for now still does not include the Voice Guidance and a couple features. But we hope that within short time these options are available.
Download |Ovi Maps Loader