![]() They use a transponder that re-transmits anything it hears on a much higher downlink frequency. The satellites that listen to the beacon frequencies don’t process the signals. By 2021, 3,632 people were rescued thanks to the system. The first rescue from this system was in 1982. ![]() These beacons are often attached to aircraft or ships, but there are an increasing number of personal beacons used by campers, hikers, and others who might be in danger and out of reach of a cell phone. ![]() Nominally, a person in trouble activates a 406 MHz beacon, and any of the 66 satellites that host COSPAS-SARSAT receivers can pick it up and relay information to the appropriate authorities. The traffic originates from COSPAS-SARSAT, which is a decades-old international cooperative of 45 nations and agencies that operates a worldwide search and rescue program. But has been listening to GPS voice traffic. Your phone and your car probably do that multiple times a day. Tuning into a GPS satellite is nothing new.
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