The Global Positioning Satellite System (GPSS) which consists of satellites plus control and monitoring stations, is opening navigation and positioning uses that were never dreamed of by the US Air Force developers of the GPSS. Older flight-control and navigation systems are destined for the surplus market, but new GPSS problems keep appearing. These problems and their solutions were addressed by the nation's top authorities in the Plenary Session of the Institute of Navigation, National Technical Meeting, Anaheim, California (January 1995). From the audience of nearly 500 came written questions which challenged the panel of experts.
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