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Inception of GPS
The Doppler Effect gave scientist the idea that satellites in space could be tracked from Earth by measuring the frequency of radio signals. -
First Satellite Navigation System
It was built by the Navy to locate submarines. -
Continous Signals
The Aerospace Corporation figured out that if you send signals continuously, moving vehicles and aircraft could be tracked. -
First GPS Satellite into Space
The branches of the military launch the first of twenty-four satellites into space which they refer to as NAVSTAR. -
Launched GPS System
The military launched 11 more satellites that carried atomic clocks to measure times more accurately. -
GPS in Commercial Aircraft
Used in commercial aircraft to increase safety and navigation. -
First Fully Operational Satellite into Space
They launched it into space using a Delta II rocket. -
First Hand-held Navigation Device
Magellan Corporation is the first to market hand-held navigation device. -
GPS System Completed
The first GPS system was completed when the last satellite was launched in 1995. The satellites circled the globe two times per day. -
GPS in Mobile Phones
Mobile phone manufacturer Benefon launched the first commercially-available GPS phone that was sold mainly in Europe. -
In-car Navigation
Private companies began producing personal GPS products. -
Assisted GPS
Cellular signal and GPS signal to locate the user to within feet of their destination. This is the way we think of GPS now. -
Two New Satellites
The two new satellites enhanced the existing GPS and allows the GPS to stay in operation in the next generation. -
31 Operational Satellites
At least 24 GPS satellites are operating at all times with three deactivated satellites that can be reactivated if necessary.