1. The Global Positioning System (GPS) is a satellite-based navigation system made up of a network of 24 satellites placed into orbit by the U.S. Department of Defense.

2. GPS was originally intended for military applications, but in the 1980s, the government made the system available for civilian use.

3. GPS works in any weather conditions, anywhere in the world, 24 hours a day. There are no subscription fees or setup charges to use GPS.

4. GPS satellites circle the earth twice a day in a precise orbit. Each satellite transmits a unique signal and orbital parameters that allow GPS devices to decode and compute the precise location of the satellite.

5. GPS receivers use this information and trilateration to calculate a user's exact location. Essentially, the GPS receiver compares the time a signal was transmitted by a satellite with the time it was received. The time difference tells the GPS receiver how far away the satellite is.

6. With distance measurements from a few more satellites, the receiver can determine the user's position and display it on the unit's electronic map.

7. A GPS receiver must be locked on to the signal of at least three satellites to calculate a 2D position (latitude and longitude) and track movement. With four or more satellites in view, the receiver can determine the user's 3D position (latitude, longitude and altitude).

8. Today, GPS is a vital part of global navigation and has been integrated into cars, phones, and other modern technologies.

Question

1. The Global Positioning System (GPS) is a satellite-based navigation system made up of a network of 24 satellites placed into orbit by the U.S. Department of Defense.

2. GPS was originally intended for military applications, but in the 1980s, the government made the system available for civilian use.

3. GPS works in any weather conditions, anywhere in the world, 24 hours a day. There are no subscription fees or setup charges to use GPS.

4. GPS satellites circle the earth twice a day in a precise orbit. Each satellite transmits a unique signal and orbital parameters that allow GPS devices to decode and compute the precise location of the satellite.

5. GPS receivers use this information and trilateration to calculate a user's exact location. Essentially, the GPS receiver compares the time a signal was transmitted by a satellite with the time it was received. The time difference tells the GPS receiver how far away the satellite is.

6. With distance measurements from a few more satellites, the receiver can determine the user's position and display it on the unit's electronic map.

7. A GPS receiver must be locked on to the signal of at least three satellites to calculate a 2D position (latitude and longitude) and track movement. With four or more satellites in view, the receiver can determine the user's 3D position (latitude, longitude and altitude).

8. Today, GPS is a vital part of global navigation and has been integrated into cars, phones, and other modern technologies.

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