It is a freeware program to view on 3D digital elevation maps mixed with data acquired with GPS.
It can be used just for viewing terrain meshes or to see your tracks and waypoints projected on the terrain mesh. Personally, I'm using DG Terrain Viewer very enthusiastically, when I go out to geocaching or ride my bicycle, and use my GPS, when I'm back at home, the first thing I do is turn on the computer and see my track and waypoints over and between the mountains.
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