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Google maps is free as in beer but doesn't usually show hiking trails. OpenStreetMaps is a free and open source site that works sort of like Wikipedia, and it often has good coverage of hiking trails, but the coverage may be somewhat hit-or-miss. For example, I've put in some trails for specific areas in California that are near my house or that I've ...
Bing maps supports topo-maps (in the UK at least and not on the mobile client) via the ordanace survey
I have used the listed below website for as long as they have been around. They provide very detailed and regularly updated maps from the national survey association. I recommend getting a lamination machine and printing off these maps that are along the trail just before leaving for your trip. The weight is no more than carrying the Guthook book. ...
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