Navigation
GPS BIIRM-4 (PRN 15)
GPS Navigation Satellite (Block IIR-M) · US Space Force
Right now
LiveIt moves every second. See exactly where it is — worked out from its orbit, on your own device — on the live 3D globe.
- Over
- —
- Altitude
- —
- Speed
- —
GPS BIIRM-4 (PRN 15), launched in 2007, is a Block IIR-M satellite carrying the M-code and L2C signals into an operational orbital plane. By this point in the GPS modernization program, roughly a third of the active constellation had been upgraded to broadcast the new dual-frequency civilian signal, gradually improving positioning accuracy for any receiver capable of using it. Block IIR-M's M-code signal, standard on this satellite, remains the primary jam-resistant military GPS signal in operational use today, protecting positioning accuracy for US and allied forces even in electronic warfare environments designed specifically to disrupt ordinary civilian GPS.
Its orbit
- Orbit
- Medium Earth Orbita high vantage point, ideal for navigation
- Altitude
- 12,267–12,825 mi (19,741–20,639 km)
- Inclination
- 54.2°
- One orbit
- 12.0 hours2.0 orbits a day
- NORAD ID
- 32260
- Int’l designator
- 2007-047A
- Launched
- 2007
Orbital elements from CelesTrak, as of 22 Sep 2026.
More navigation
- GPS BIIRM-5 (PRN 29)GPS Navigation Satellite (Block IIR-M)
- GPS BIIRM-6 (PRN 07)GPS Navigation Satellite (Block IIR-M)
- GPS BIIRM-8 (PRN 05)GPS Navigation Satellite (Block IIR-M, Final of Generation)
- GSAT0101 (GALILEO-PFM)European Navigation Satellite (Galileo, Founding Satellite)
- GSAT0102 (GALILEO-FM2)European Navigation Satellite (Galileo, Founding Satellite)
- GSAT0103 (GALILEO-FM3)European Navigation Satellite (Galileo)