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National Geographic Maps web-based TOPO! Explorer (NG TEX) aims to be the iTunes of electronic mapping. Like iTunes, the application is free, and, like songs, a 1:24K USGS Topographic Quad, including satellite imagery, is only $1 (vs. $8 -$10 for a paper Quad without satellite imagery). If you own a Magellan Triton GPS it's fairly simple to download that map to your GPS. In the field, the maps look just as good on the Triton GPS as they do on your computer. Like iTunes, the NG TEX application works and looks the same on Mac and PC.
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