This video reminds hikers of the importance of carrying low-tech supplies like a loud whistle and a map, in addition to satellite devices like PLBs.
In the Great Smoky Mountains, the guide map also has survival tips on the back that can help in the event of distress.
View the video here:
http://www.wbir.com/story/news/2015/07/28/smokies-search-rescue-satellite-technology/30807611/