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GPS-IIIA (Global Positioning System) is the first evolution stage of the third generation of the GPS satellites. It consists of the first ten (known as "tranche") of GPS III satellites. This program will improve position, navigation, and timing services for the warfighter and civil users worldwide and provide advanced anti-jam capabilities yielding superior system security, accuracy and reliability.
Stage Expended
Limiting rule: No flight through a thick (>4500 ft) cloud layer extending across the freezing level.
max-top 7900 m, mean 5507 m, 100% cover, freezing 5054 m · max cloud-top 7900 m above freezing 5054 m (100% cover in 10 nmi) · no GLM flashes within 25 nmi / 30 min, likely cirrus / stratiform ice rather than cumulus