Submitted by guanaco55 t3_ybwbkb in UpliftingNews
neuropean t1_itl11kk wrote
Reply to comment by parsifal in A train passenger saw a woman waving for help. It was a hiker who'd been missing. by guanaco55
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.
parsifal t1_itl63b9 wrote
Cool, good tip.
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