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Title: Unfortunately its the only one with downloadable mapping...
Review: This topo set doesn't have the necessary detail and I found myself buying printed maps at the local REI.... The software is very simplistic and map detail very poor. Unfortunately you can't download any other National Geographic Topo or Maptech maps into the Garmin unit so you're stuck with Mapsource. Bummer. I'll stick with printed USGS maps.
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