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SECOR 3 (EGRS 3) was launched from the Vandenberg AFB via a Thor Agena D launch vehicle. This small geodetic SEquential COllation of Range (SECOR) spacecraft was used to precisely determine points on the earth. Experiments with these led to Timation, and finally to the GPS Navstar system.

Alternate Names

  • EGRS 3
  • 01208
  • SECOR3

Facts in Brief

Launch Date: 1965-03-09
Launch Vehicle: Thor Augmented Delta-Agena D
Launch Site: Vandenberg AFB, United States
Mass: 18 kg

Funding Agencies

  • Department of Defense-Department of the Army (United States)
  • Department of Defense-Department of the Navy (United States)
  • Department of Defense-Department of the Air Force (United States)


  • Navigation/Global Positioning

Additional Information

Questions and comments about this spacecraft can be directed to: Coordinated Request and User Support Office

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