Hi all, i just bought a Garmin Nuvi 2597 and a 8GB SD card in USA, and it came with US maps on the GPS. Im gong to use the GPS in Brazil and USA, and as my first time im going to need some help(I read some tutorials still do not know how to proceed):

1-Which files should I download?
2-Where to put the files on the SD(folders,...)
3-Where do i change the satelite to Brazil?
4-Whats the diference between the lock and unlock version?(i know 1 is lock and the other isnt....heheheh, but what influences me in gps?)

PS:I already installed MapInstall, MapSource, BaseCamp, POI Loader, Garmin Express and WebUpdater