A secure, portable position locating radio has a geolocation receiver providing local position and timing information from geolocation means (e.g. GPS satellites) and a local transceiver for sending local position information to a communication system (e.g., an airborne or orbiting transceiver). A crypto...http://www.google.de/patents/US5969673?utm_source=gb-gplus-sharePatent US5969673 - Position locating rescue transceiver
