Sean Fidler wrote:
how can I get USA maps and waypoints?

Pregenerated maps: http://www.xcsoar.org/download/maps/

Generator for custom maps: http://www.xcsoar.org/mapgen/

Waypoints: the usual sources, e.g. http://soaringweb.org/TP

Put all data files in the directory XCSoarData on the SD card. Then
configure them in XCSoar, that is described in the manual
(http://www.xcsoar.org/discover/manual/); quick version: double-tab
the screen to open the menu, choose "Config / Config / Setup System".