The subs often had to wait hours to receive signals from the satellites, but the model set the stage for true GPS with continuous signaling from satellites in space.ġ963 The Aerospace Corporation completed a study for the military that proposes a system of space satellites that sends signals continuously to receivers on the ground and could locate vehicles moving rapidly across the earth’s surface or in the air. The system was designed to locate submarines, and started out with six satellites and eventually grew to ten.
Currently, a total of 31 GPS satellites orbit the earth twice a day.ġ959 The Navy built the first real satellite navigation system, which it called TRANSIT. Here are the major milestones along the way.
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