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parsifal t1_itkzous wrote

Reply to comment by churdtzu in A train passenger saw a woman waving for help. It was a hiker who'd been missing. by guanaco55

I’m not the commenter but I think with shiny things you can reflect sunlight at planes.

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neuropean t1_itl11kk wrote

Not just planes, can be used to signal any distance with open line of sight. If they see people off in the distance, it could be used for that as well.

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