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I prefer visual (DVD) also as the preferred way to learn, but after searching the web and other literature the most recommended source I found was a book: “Wilderness Navigation” by Bob and Mike Burns, printed by the Mountaineers, in Seattle. It even has sample problems in the appendix to make sure you have learn the information. I checked it out from the library and after reading it I purchased the book for my personal library. It’s the best I’ve found on the subject
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