Here's another signal mirror video by Tony Nester,
author of four books on outdoor survival whose
been teaching outdoor survival since 1989.
http://www.apathways.com/Subjects/About/aboutus.htm

The video is here:

Survival Skills 101: Signal Mirror 2:41

http://outsideonline.com/culture/how-to-videos-sp.html?vid=60923787-f25b-43b7-8a60-0c7e2e6b08bb
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A signal mirror should backup a radio distress signal, like a 406 MHz PLB (ACR PLB) (Ocean Signal PLB)