GPS Visualizer (GeoVisualizer) is a free utility that creates customizable maps and profiles from GPS data (tracklogs & waypoints), addresses, or coordinates.
Geocaching is a treasure hunting game where you use a GPS to hide and seek containers with other participants in the activity. Geocaching.com is the listing service for geocaches around the world.
GPSBabel converts waypoints, tracks, and routes between popular GPS receivers and mapping programs. It also has powerful manipulation tools for such data.
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