I read that there is at least one news story of a stranded individual signaling distant rescue search parties (boats on the horizon?) by using his consumer laser pointer, he happened to have on him, and it worked!
I'm thinking of including one in my survival kit for this very purpose, super long range emergency signal flashing, but I can't find the article. Anyone have any leads for me? Thanks.
Also how spread out is the beam, on average, after, say a mile?