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Title: Worse than useless
Review: I would have to agree with "working engineer." This software is worse than useless due to its positional inaccuracy. I was shocked to find that my 76csx showed the location of my house as several hundred feet from its actual location. A downloaded track of a run in a local park showed this same "offset." I tried an experiment: created a waypoint by standing in the middle of an intersection in my neighborhood, then downloading it. The MapSource Topo US 2008 software showed an offset error of about 800 feet. Google earth showed it dead on (so I knew it wasn't a problem with the GPS unit itself). My older version of NG's Topo! also shows this waypoint at its proper location at the intersection. Interestingly enough, Delorme Topo 6.0 has the same offset error as the Garmin mapping software.
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