This past Friday a pretty big anniversary quetly went by. Prior to July 19, 1977 there were no GPS satelites. Good read from ABC 27 WHTM on the developement and history of GPS!
On July 19, 1977, the first GPS satellite signal, transmitted from Navigation Technology Satellite 2 (NTS-2) was received at a building of the Rockwell-Collins Company in Cedar Rapids, Iowa. A company engineer named David Van Dusseldorp sat on the rooftop and manually adjusted an antenna every five minutes to keep tuned in to the signal, which was decoded by a receiver in the building that was six feet tall and had two seats for the technicians.
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