How does GPS work, and what is its cost, and is it becoming a danger in our lives and can it be dispensed with?

Start GPS set-up.
The US government began the GPS project in 1973 to overcome previous navigation restrictions, combining earlier ideas, including covert engineering studies.
The US Department of Defense has developed the system, which originally used 24 satellites. The system became fully operational in 1995. The device was created for military action to provide a navigational system for the US military and its allies. At the beginning of the manufacture of GPS devices, the size of the equipment was very large and no ordinary person could carry it.
How GPS works
The GPS system consists of 24 satellites hovering around the Earth at an altitude of 20,200 km. A satellite transmits a signal to its position, ie, the location of the satellite, and carries the timing or moment of transmitting the signal at high resolution to a precise atomic clock.
The receiver receives signals coming from the satellite. By comparing the timing of the signal's arrival and the timing of its transmission, the device can determine the signal transmission time and thus calculate the distance between the satellite and receiver,
By receiving three signals from three different satellites, their junction points to the location of the receiver. By increasing the number of satellites observed, the receiver can correct some errors associated with the calculation method and thus increase its accuracy

3- Cost
The World Space Agency took 30 workers to develop it and needed $ 30 billion in investment.

How does it reach us?
The GPS device was launched for civilian life in 2000. US President Bill Clinton announced the development of the use of the GPS device to be used in civilian life with a precision signal not exceeding a few meters. Development of the device to be used in engineering and surveying
It is used in civil life in the hands of everyone with ease, where it is used in communication networks, mobile phones, cars and bicycles.
Has GPS become a danger in our lives and can it be dispensed with?

The impact of a solar storm not taken seriously by the authorities and the space agency was described by the US president as a technical disaster. Nearly half of the GPS devices stopped working indefinitely. The result was a very heavy traffic jam, planes that did not leave the airport and panic about shipping. Bank transfers were problematic and the New York Stock Exchange closed

In March 2012 something happened to show us how much we needed the GPS system. NASA said it had picked up a large solar explosion on the surface of the sun. The blast triggered a storm of charged particles that would hit the ground at 2,000 kilometers per second to affect GPS navigation systems and some satellite-based communications services
If the storm intensifies (its speed and its time), its effects may reach the separation of electricity networks in full. Therefore, electricity companies were warned all over the world, as happened in 1989, when electricity was cut off from 6 million people

A disaster on the coast of the Soviet Union in 1983 crashed a Korean civil transport plane that killed 269 victims
Two Soviet warplanes shot the Korean plane and crashed into the river because of a pilot error. The plane entered the Soviet airspace after a mistake in locating the Soviet Air Force thought the plane was a US spy plane.
The incident occurred as a result of a mistake in locating here. We see the importance of GPS

The most important thing in this post is that GPS is becoming accessible to everyone but it is still a military system that can be immediately stopped and stopped in crisis if the United States can make GPS systems for all, can not it block them if they want to?
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