I tried google earth a couple of times but couldn't get the resolution I needed.
I'm now using USAPhotoMaps (www.jdmcox.com) along with the CDOW mapping tool.
They are great tools for researching various units in CO.
Once I find an area, I normally print out the satellite photo and Topographical maps on opposite sides of waterproof paper. It folds up nicely and easily fits in a shirt pocket. The maps usually lasts for at least one season.
AB