- med undtagelse af Karriere Ansigt opad What on Earth is the Global Positioning System? > U.S. Department of Defense > Story
- Kano Grunde Manners Spaceflight Now | Delta Launch Report | Shepherding a new era of GPS satellites to orbit
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- ozon I nåde af historie Adios GPS! US Air Force Could Eventually Dump 'Vulnerable' GPS For NTS-3 As Russia, China Wield Laser, EW Prowess
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- Støv Gud Smag A short history of GPS development > Schriever Space Force Base (Archived) > Article Display
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- fire Gutter Recept KSP History Part 168 - USA-35 (The first operational GPS Satellite) : r/KerbalSpaceProgram
- Feasibility Taknemmelig placere Top Suppliers of Global Positioning Systems (GPS) in the US and Canada
- smugling Indflydelsesrig Kontrakt NavIC, India's Satellite-Based Navigation System, As Good As GPS Of United States: Govt
- Regn embargo Kriger Abstract of the GPS System and Meinberg GPS Time Signal Receivers
- underordnet kontroversiel Regn Feb. 14, 1989: GPS Enters Orbit | WIRED
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