Regarding the 7/15/2015 rescue of Tim Gorske:
Tim Gorske's PLB was an ACR ResQLink, not a SPOT.
He tells his story here:
https://www.acrartex.com/stories/803eae6e-706b-4b79-8cb4-8c52574f3cec
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A signal mirror should backup a radio distress signal, like a 406 MHz PLB (ACR PLB) (Ocean Signal PLB)