NAVSTAR System

• Engineered by Rockwell Int’l

• Over 30 SVs launched since 1978

• Two launch failures (1981, 1997)

• Average life-span, 7 years

• Satellites launched in three “blocks”

• Inital operational capability: 12/8/93

• Full operational capability: 4/27/95

• 21 SVs + 3 spares

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