“GPS Essentials is the most complete GPS tool on Android Market: Navigate, manage waypoints, tracks, routes, build your own dashboard from 45 widgets.”
GPS Essentials is a great, free app for a smart phone to create some simple, geospatial data. Need to create a GPX file with various waypoints (that imports nicely into ArcGIS)? Try GPS essentials (or if you only need linear data about where you’ve been, Map My Run works if you don’t mind needing a desktop to download the GPX file).
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