GPS tracking systems have penetrated our lives like never before. Today they are being used as personal security devices on a very large scale. The workings of these personal security devices are among the best of human engineering endeavors. They work like magic. Your personal gps tracking devices come with a unique identifier which differentiates it from other such devices. It acts like a beacon and can communicate with the GPS satellites revolving around the earth. SAR personnel can probe you identifier. The next time your personal tracker talks to the satellites, they would report your location to the SAR workers.