I'll probably step on some toes, but here goes

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I've spoken with Don on a couple of occasions, and I've read all of his books. His Compass Course book is the best one, IMHO. Good stuff here, but most people won't keep a pace count in the field, which is why maps rule.
He has some very advanced and truly weird ideas. But they work. Useless for the most part, but to each his own.
Most of the stuff written on survival is really more on wilderness living and crafting in the bush, rather than real-world survival tactics. Yes most of the stuff works, but there's no use for the advanced techniques or the expensive gear IMHO, unless you just want to learn it for fun.
Don't feel you need fancy firestarters, forty pound packs, and expensive knives to survive comfortably while navigating to safety or awaiting rescue.
You also don't need all kinds of bits and pieces like nails and needles, magnifying glasses, etc. for a survival kit. If you want it, fine, but it'll probably never get used.
We tend to make this into a James Bond complicated affair

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The most used items will be a quick form of shelter like a rainsuit, poncho, or a couple of trashbags, a flashlight of some sort, and a regular old Bic lighter. A brew kit as mentioned in another thread will also be well worth it.