I missed this one on April 8-9, 2012, Ortega Mountains.

Rescuers vector in heliocopter with signal mirror.

Search and Rescue San Mateo Trail
http://www.rmru.org/missions/2012/2012-011.html
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A signal mirror should backup a radio distress signal, like a 406 MHz PLB (ACR PLB) (Ocean Signal PLB)