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[–] captaincalorie [S] 0 points 3 points (+3|-0) ago 

I worried about that too for a while, but I actually purchased a Personal Locator Beacon (PLB) about a year ago. It was around $200 on Amazon and you can send out an emergency alert from literally anywhere on earth (excluding the north / south pole). I used it when I hiked the Pacific Crest trail on the west coast.