+1 to all of the ideas so far; SPOT navigation, emergency whistle & mirror, charged cell phone, maps, guidebooks & compass knowledge, the buddy system, GPS device, surveyors’ tape, etc. In fact, look into if a satellite phone would have better/worse reception in an emergency situation. This sounds silly, but given a choice between getting seriously lost and pooping in front of every thru hiker I’ve ever met, I would gladly carry a Wag Bag and drop trou along the trail. Don’t camp, don’t relieve yourself, don’t journey too far from the footpath.
Whatever system you use, practice it until it is second nature and comfortable as walking. For me, staying found while hiking in the wilderness has always been about bringing 1-2 pounds of maps and guidebooks for any section and reading/planning ahead. Another huge resource to have is a backup plan to fall back on when everything else goes to sh*t. On the CDT in '11 I found my orienteering skills (they are horrible) most tested and it helped to have an emergency “what if?” to have in my back pocket to keep me calm, rational and making smart decisions. I was hiking SOBO, and my backup plan was this;
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hike due south (I had a tiny thermometer/compass/keychain attached to the right shoulder strap of my backpack).
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hit a flowing groundwater supply.
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follow the water downstream.
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hit a road.
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then I am found!!!
I never, ever, ever had to use this plan, but it was sweet for my confidence to know it front-to-back and back-to-front. Of course, the entire plan hinges on me not misplacing my backpack with the compass attached to it, but staying with a line of sight to my backpack for 4.5 months is a small price to pay for a successful thru hike. In fact, misplacing gear is an entirely separate problem that may lead to getting lost and thus may be linked to getting lost but they are two different things altogether. Happy trails! Stay found.
Space Monkey