For Eagle Scouts, these handy digital guides are a great refresher course. For everyone else, they serve as primers that can save a life by showing you how to sterilize water in the wild or by sending a signal with your GPS coordinates to contacts in an emergency. Search through them to find chapters on making weather resistant shelter for the night or if you need to know which knot to use to secure a canoe. The US Army has more than 500 hardcopy field guides — think of these apps as carefully curated lists of the most useful, practical advice.
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