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This Concept Map, created with IHMC CmapTools, has information related to: david, GLOBAL POSITIONING SYSTEM when it was invented HISTORY, ORBITAL SATELLITES Functions Precise Measurements, ORBITAL SATELLITES Functions Triangulates user, GLOBAL POSITIONING SYSTEM GPS relies on ORBITAL SATELLITES, ORBITAL SATELLITES Functions Navigation, ORBITAL SATELLITES Functions Controlled by DND, GLOBAL POSITIONING SYSTEM who uses it MILITARY, GLOBAL POSITIONING SYSTEM GPS relies on RECEIVER, GLOBAL POSITIONING SYSTEM who uses it CIVILIAN, ORBITAL SATELLITES will encounter ERROR SIGNALS