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How Do GPS Gadgets Guide Us?

Knowing a little of how GPS systems work will make you more appreciative of their complexity and make you less likely to balk at the price tag.  More and more often, GPS units are being added as standard features in the latest cars and personal electronics such as PDAs and cellular phones.  This article will explain in words that the average person can understand how GPS systems operate. If you need a more technical explanation, there are other articles on the World Wide Web that cover that.

GPS for Beginners

There are roughly 2500 satellites currently in orbit around the earth.  Rather a significant percentage of them are global positioning satellites.  Yet only 36 of them are actually in use with many others having been retired.  These satellites transmit a consistent low-power signal which is received by GPS receivers such as the unit in your car.  In order to determine an exact location, the GPS system measures its distance from three of these satellites.

GPS systems satellites are nearly seventeen feet across when their solar power panels are fully spread out.  They are powered by the sun and also by a backup battery supply if necessary.  They are designed to be functional for a minimum of ten years and weigh some 2,000 pounds. The oldest satellite is from 1978.  His task is to tell the younger satellites how tough it was in his time and how much easier the new models have it. Just kidding!

But Seriously

Earlier I wrote a little about GPS receivers. So what are they exactly?  If a device is able to receive the signals sent by GPS satellites, it can be considered a GPS receiver.  There was in all probability a GPS receiver on that cruise ship you were on last summer, another in the taxicab you had to the airport last week and then there’s that Navigon 7100 GPS that your boss just purchased for his auto.  Portable GPS systems for public use are averaging out around $300, give or take a few dollars.  Considering you didn’t have to invest anything to design, build and launch the satellite into space, $300 is a very conservative price.

It’s the US government who foots the bill for constructing the satellites and launching them into space. All you have to do is click on your GPS system in order to make use of the information that is freely transmitted by them. So now you should have a pretty good understanding of what goes on behind the scenes when you switch on your GPS system.

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