Block II

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Navstar Block II navigation GPS satellite

Illustration of Earth surrounded by intersecting red orbital paths, each with GPS satellites positioned along them, and an inset showing a detailed view of a Navstar Block II navigation satellite.

Block II

satellite

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GPS
The Navstar system
…and 23 heavier and more-capable Block II production models were sent into space from 1989 to 1993. The launch of the 24th Block II satellite in 1994 completed the GPS constellation, which now consists of two dozen Block II satellites (plus three spares orbiting in reserve) marching in single file…
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…and 23 heavier and more-capable Block II production models were sent into space from 1989 to 1993. The launch of the 24th Block II satellite in 1994 completed the GPS constellation, which now consists of two dozen Block II satellites (plus three spares orbiting in reserve) marching in single file…
Read More