Bowditch
I have noticed numerous errors in concept regarding usage of GPS, compasses, maps(charts), and applications of these regarding finding ones way out of "nowhere" ie "which is the best compass or GPS etc.". A "cheap" unit in many cases may assist you as well as an expensive one if it is properly used. In many cases it's not the "unit" that is at fault, but the transfer of the data to paper or the interpetation of the data. GPS is based on the concept that the earth is a "spheriod" and it's actually an "oblique spheriod". Transfer of data can conflict when you transpose from "electronic to paper". "How come I'm right at such and such location and the GPS says I'm a mile south?". "Something must be wrong". There is a publication "The American Practical Navigator" by Nathaniel Bowditch which was simply written, very understandable, and is found aboard Merchant and Naval ships worldwide. It explains compasses, GPS, and celestial science and their practical uses. It can be had on line, at any nautical bookstore, or at any "library". If you intend to make the big trip, it's got great information that, in essence, will build you confidence in "Gettin yourself around". Good luck, good reading, and good riding! Captain Smitty
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