I'd read about these a year ago and found them really interesting. I am currently attempting to learn Land Navigation, i.e. landnav, and am reading about how to navigate with a compass, more than simply reading N,S,E&W. It's a little more complicated that I thought but I find this interesting. Thanx for sharing.
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"All that is gold does not glitter,
not all those who wander are lost..." J.R.R. Tolkien
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