FoxtrotGPS is a fork of Marcus Bauer's TangoGPS project, with a focus on cooperation and fostering community innovation. It is a lightweight moving map application that can be used with or without a gps unit. By default, maps tiles are downloaded from the OpenStreetMap project, but other sources are available, and new ones may be added. Map areas may be downloaded and cached for use while offline. WWW: http://www.foxtrotgps.org