[quote=rafowell]This New Zealand hiker found a man lying in a stream in the woods with a head injury.

The hiker used his PLB to summon help (no cell coverage), but the helicopter had trouble locating them due to the tree canopy, and (judging by the photo - see linked article below) there was no place to land nearby.

The hiker found a spot of sunlight and used his signal mirror through a gap in the canopy to signal the helicopter. ( Since he's in a Commonwealth country, he refers to it as a "heliograph mirror").

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Even with all the technologies, you still need the basics!