The inland hiking experts also recognize the value of having to be SEEN TO BE RESCUED!:
“…even something as simple as carrying a brightly colored bandanna and hanging it from a tree can be the difference between being found and staying lost — or as in Largay’s situation, the difference between life and death.”
http://www.startribune.com/whatever-your-trail-smarts-stay-wise-in-the-woods/381662401/