FoxtrotGPS is an easy to use, free & open-source GPS/GIS application that works well on small screens, and is especially suited to touch input. It spun off of tangoGPS in 2010 with a focus on cooperation and fostering community innovation. FoxtrotGPS is freely available to the public for use, redistribution, and modification under the terms of the GPLv2. Requires gpsd.
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