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When the message arrived from the Alaskan wilderness, it was simple, brief, and urgent: tipped raft. The two paddlers who sent it had just almost drowned, and their food and gear had disappeared downriver. But they had one thing going for them, a small, handheld emergency beacon they could use to share their location and ask for help. It sent a signal more than 3,000 miles south, to Montgomery, Texas, where…
