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  • An abbreviation for Global Positioning System
  • Was originally less accurate civilians due to a system of Selective Availability, but this system was later stopped via software on midnight on May 1, 2000, and Block-III satellites will be physically incapable of it, so this will remove it in hardware over time
  • A USA Owned and Run Navigational Satellite Constellation
  • The first system of it's kind from SECOR which was a survey system adapted into a crude SATNAV system to Block-1 of GPS
  • Worldwide Coverage (Albeit with lesser coverage in certain areas, and this becomes less of a problem with each new launch)
  • Is also augmented for use in certain regions using GNSS Augmentation methods

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