You CAN'T user Microsoft Streets and Trips on any nokia because it needs a Windows® software ! Maemo Mapper use Google/Virtual Earth/(and some others online) maps. It can be used for in car nav BUT it needs internet each time you need to route/reroute and maps are not included, you need to download each tiles(jpg) of map you need (at each zoom you need...) : consider MM not as a nav software but as a mapping software.