Quote:
Originally Posted by tis
We have a buoy near our house which is not even close to where it used to be when we first were in this location in 1985. ........ What year did they start using GPS, anybody know?
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"Overview
The GPS project was started by the U.S. Department of Defense in 1973. The first prototype spacecraft was launched in 1978 and the full constellation of 24 satellites became operational in 1993."
www.wikipedia.org/wiki/Global_Positioning_System