I been using sygic maps program for the n900 and it works great without data paln on my tmobile here in USA california. All I do is laod up the sygic maps program and it takes about 30seconds to 2 minutes or so for the n900 internal gps to connect and I do have that location settings checked/enable using the google address rather than the default nokia name that was in there.

And it sygic works awesome it has voice turn by turn and once the gps is loaked and connected I can search for address's and it finds and makes thje routes and everything all without a data plan internet connection.

I use it to go to customers locations with my onsite mobile computer tech bussiness.