Yesterday in Santa Barbara County, California, a lone overdue hiker, lost and bogged down in heavy brush, was spotted when he signaled the SAR helicopter with his signal mirror, and got a flight to safety.

Read the (fairly thorough) report from the Santa Barbara County Sheriff's office here:

SAR Finds Lost Hiker - Santa Barbara, California
A signal mirror should backup a radio distress signal, like a 406 MHz PLB (ACR PLB) (Ocean Signal PLB)