A man of 42 years in Maryland with his dog was lost during a hiking on a mountain. After revolved around the same place for more than four times, he realized that really was lost, at which time police were notified and immediately sent a helicopter to find the man.
Although traveler tried to find your location through GPS, it tells the wrong coordinates because that could not provide the necessary data to find police easier. But what this man saved his dog was with all his phone, specifically LED flash with which it was provided (iPhone 4) and which used to be spotted by the police air crew. Finally, because this type of signal, after more than four hours, the man was saved.