In the book, Nelson writes that she expected her cell phone would be able to contact emergency help until she had to use it and found out there was no signal.  So she actually  thought she had a communication device to call for rescue.   Also, one problem with rescue beacons is that the expectation that help will come can lead to more risky behavior.      https://www.sciencedaily.com/releases/2016/09/160913101127.htm

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