Here's a possible - reporter didn't sound too confident.

3/28/2010 Lost hiker in Crestline California

http://rimoftheworld.net/columns/neufeld/missing_hiker

"A source close to the operation indicated a mirror or other shiny object had possibly been used by Gerald to attract the attention of the search helicopter."



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A signal mirror should backup a radio distress signal, like a 406 MHz PLB (ACR PLB) (Ocean Signal PLB)