A 406 personal locator beacon was set off, prompting a rescue crew to think it might be from a crashed aircraft.
Rescuers discovered that a 68-year-old backpacker had set it off after being severely mauled by a grizzly, and tasked two helicopters to bring him to hospital.
Read more here:
https://www.cbsnews.com/news/grizzly-bear-attack-rescue-beacon-wyoming/