List Of MapTilePacks - AndNavWiki
pare che sia possibile scaricare la "mappa" dell'italia
A MapTilePack is essentially a zip-file containing a couple of subfolders which contain files. All you need to do is unzip that file to the memory-card of your Android device, so that you have a folder-structure like this:
[SDCard]/andnav2/tiles/mapnik/0/0/0.png.andnav