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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 cumulus cloud with top at or above the freezing level.
max cloud-top 7635 m above freezing 5120 m (100% cover in 10 nmi) · no GLM flashes within 25 nmi / 30 min, likely cirrus / stratiform ice rather than cumulus · max-top 7635 m, mean 5874 m, 100% cover, freezing 5120 m