Global positioning system uses twenty-four different military satellites, which were developed by the United States Department of Defence and it was first used in the Cold War . The military has been using GPS extensively for about ten years, using it in Desert Storm and modern practice. Only recently is GPS being used outside the military.

It takes three satellites to find your position. Each of the satellites sends a radio signal down to your GPS receiver, and the receiver measures how long it takes the signals to get there. This happens

His secret weapon: a global-positioning-system (GPS) receiver in his car and mapping software on a notebook computer. 'Everybody else was fighting to get around this police blockade, but we were miles ahead by using back streets.' "

very fast because the radio signals travel at the speed of light. The time the signal took to reach the receiver is then multiplied by the speed it was moving (approximately 186,000 miles per second), and that is how far you are away from that satellite. This is done with the other two satellites, and your location is then found within a few meters. That is basically how it works but you must also correct for any delays the signal experiences as it travels through the atmosphere.

It takes three satellites to find your position. Each of the satellites sends a radio signal down to your GPS receiver, and the receiver measures how long it takes the signals to get there. This happens very fast because the radio signals travel at the speed of light. The time the signal took to reach the receiver is then multiplied by the speed it was moving (approximately 186,000 miles per second), and that is how far you are away from that satellite. This is done with the other two satellites, and your location is then found within a few meters. That is basically how it works but you must also correct for any delays the signal experiences as it travels through the atmosphere.

Global Positioning isn't just for finding out where you are. GPS has some pratical uses in farming, construction and in many more areas. When a farmer is out in the field, they find out how much pesticides or fertiziler to put on the exact area of the field they are on, going by the history of the soil when they are out on the field. All they need is a computer and a Global Positioning System locator. It once took surveyors hours to take measurements, but with GPS they can take precise and accurate measurements in just seconds, saving them hours of work. The pillars that support Confederation Bridge, which runs thirteen kilometres from Prince Edward Island to New Brunswick, were put into place by a crane. The crane was controlled by Global Positioning System. This system was accurate to within just a few centimetres.

Not only can Global Positioning be used on land, but also in the air, and on the water. For fishermen, a favourite fishing spot can be marked, so they can return to the exact same spot within one hundred meters, even in the middle of the ocean. Airlines can fly closer together, without having to worry about crashing into each other.

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We have all been lost before, and have had trouble finding our way to where we want to get to. Now technology is helping us find our way. This technology is called Global Positioning System (GPS). Global Positioning System technology has been used by the military for about ten years now, and is just starting to be given practical uses in society today. GPS uses twenty-four satellites orbiting around the Earth to determine where you are. GPS has many different uses, and it doesn't just have to be used to help you find your way. GPS can also be used with computer software for practical uses, such as in farming, and has safety applications as well.

"A lone Mountie gets out of his car on a quiet roadway to investigate an appare

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