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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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