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GPS BIIF-4 (PRN 27)
GPS Navigation Satellite (Block IIF) · US Space Force
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GPS BIIF-4 (PRN 27), launched in 2013, is a Block IIF satellite built by Boeing with an expected 12-year design life and enhanced accuracy over the earlier Block IIR generation. IIF satellites carry improved atomic clocks and a more powerful signal structure across all three GPS civilian frequencies — L1, L2C, and L5 — the first GPS generation to broadcast on all three simultaneously from a single spacecraft.
Its orbit
- Orbit
- Medium Earth Orbita high vantage point, ideal for navigation
- Altitude
- 12,310–12,781 mi (19,810–20,568 km)
- Inclination
- 54.4°
- One orbit
- 12.0 hours2.0 orbits a day
- NORAD ID
- 39166
- Int’l designator
- 2013-023A
- Launched
- 2013
Orbital elements from CelesTrak, as of 22 Sep 2026.
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