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    Re: Twenty years of "Longitude" and twenty years of GPS
    From: Richard Easton
    Date: 2015 Mar 13, 20:30 -0700

    Hi Frank, you wrote[quote]Also in 1995, the GPS satellite navigation system was declared fully operational after the final satellites in the principal constellation had been tested and confirmed operational. The "FOC" (full operational capability) announcement was made on April 27, 1995. The system had already achieved basic functionality, announced as "initial operational capability," less than a year and a half earlier. The practice of navigation, of course, was radically revolutionized by GPS.[/quote]It's 50 years since my Dad (and others) came up with the celestial transformation as a way of selling to the Navy his TIMATION (for TIMe navigATION) satellite based navigation system. Thus, they showed how time differences in a navigation ssytem should be equated to angles in clestial navigation which Navy officers understood.

      See http://www.gpsdeclassified.com/wp-content/uploads/2013/08/July_22_1971_Historical_Information.pdf December 1965 and 

    http://www.gpsdeclassified.com/wp-content/uploads/2013/08/NRL_GPS_Bibliography-web.pdf page 70 

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