GPS Satellite 2F-1, the first of the new generation, of GPS satellites launched May 28 after several delays after the program was announced in 1996. The 2F is designed to replace to Block 2A satellites which were launched 1990 and 1997 and were supposed to have a 7.5 year life span. 11 of those satellites are still used in the GPS constellation (4 of which were launched in 1992 or before). It is part of an $8 billion upgrade of the system which will take more than 10 years.
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