What Three Parts Make Up a GPS System?

What Three Parts Make Up a GPS System?Many people have no idea how their global positioning system (GPS) really works. Despite the sophistication of the technology, the setup is actually rather simple. There are three main parts of the GPS system.

The Space Segment

This segment consists of the satellites that orbit the earth. These satellites send out time-marked microwaves towards the Earth.

The Control Segment

These are stations on the Earth that send and receive data by way of the satellites.

The User Segment

This segment consists of the individual users and their GPS units.

How the System Works

You turn on your GPS unit. The GPS unit searches for satellites and the closest control station. The more satellites your GPS can find, the more accurate your location will be; most units will go for four satellites. Using the microwaves emitted, the GPS unit will be able to be pinpointed anywhere the satellites reach.

The accuracy of the GPS unit is determined by how many satellites are in contact with it. Other determining factors are sunspots, stormy weather patterns and the location of tall buildings around your position. Some of the most powerful GPS units can be accurate up to three feet, while most are accurate to about 48 feet.


Article Written By Heather Broeker

Originally from North Carolina, Heather Broeker studied journalism and advertising at the University of North Carolina. After graduation she moved to Los Angeles, where she worked for Fox Searchlight, Fox Reality and later as a writer and marketing director. Broeker now lives in Los Angeles and runs Head Over Heels, a writing and public relations company.

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