Sure it will work, in any country.

Just get GPS lock, open the application, choose in the options->map what tiles (images) you want to use (Google, OpenStreetMap, Google Satellite, Yahoo Satellite, Virtual Earth... wide choice) and then try to zoom in/out: either (if you have Internet) modrana downloads needed maps automatically, or you need to attach device to computer, in mass storage mode, and use PC to download the tiles:
http://wiki.openstreetmap.org/wiki/C...le_downloading
At first, I just manually saved images from
http://tah.openstreetmap.org/Browse/tile/ZOOM LEVEL/X Coordinate/Y Coordinate/
but recently, I started to use JTileDownloader

OpenStreetMap can have not good coverage in some areas; its advantage is the fact that you can personally make the map better, instead of filling in feedback forms to a company like Yahoo or Google.