I'm looking to see if anyone has used the USGS 7.5 minute [1:24 k] topo maps, version 2010. What are the differences between this and the older ones? I'm running off a nintendo 3ds right now and can't get a detailed look at them on the USGS site. Can anyone enlighten me. Right now I'm using the 1980 version for my areas. Lots of stuff missing due to major roadways being added as well as urban sprawl. Thanks guys.