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Don't know about Linux, but I use USAPhotoMaps for Windows. It uses the old USGS data available at the replacement for terraserver.com, don't recall the URL off the top of my head. What's the big deal needing Linux? None of that is very portable. When I need directions or am geocaching or in my kayak, I don't want to have to break out a laptop. I want something to replace the proprietary crap they sell for GPS receivers, not a simple map program on a PC.
Rick