Angry-looking red thunderstorms lit up National Weather Service radar screens along the northern portion of the Cape about 1½ hours before launch.

Per the company website, the GPS service is "an incredibly valuable ... "Space is a different place than it was when the first NavStar satellite was launched in 1978. Space has become a more ...

Navstar I was the first GPS satellite launched, placed in orbit in 1978 by research teams from the U.S. Air Force. Around this time, the project also began to take on the moniker of "GPS." ...

Over the past decade, GPS systems have been considered so dependable ... They believe it is the American Navstar satellite system being targeted because other devices like iPads—which can ...

“GPS satellites began for military purposes ... launched its first Navigation System with Timing and Ranging (NAVSTAR) satellite. The complete set of 24 satellites needed for global coverage ...

In 1963 The Aerospace Corporation completed a study of the subject for the military, which laid the groundwork for the modern-day GPS. In 1974, the U.S. launched the first NAVSTAR test satellite.

In 1974, the U.S. Naval Research Laboratory first launched an atomic clock into space on board the NAVSTAR NTS-1 satellite. The clocks onboard the modern-day GPS constellation are all synchronised ...

then-US Deputy Secretary of Defense William Clements signed a memo approving the Defense Navigation Satellite Development Program, which eventually built what became known as Navstar GPS.

THE NAVSTAR GLOBAL POSITIONING SYSTEM ... What are the military alternatives to GPS? Radio signals from GPS satellites are weak, meaning that an enemy can disrupt the system by drowning it ...