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global positioning systems (GPS)

How GPS Receivers Work
Image: iStockphoto.com/tobi

How GPS Receivers Work

Getting lost was a huge problem for our ancestors. Now orbiting satellites talk with a little box in our hands or in our cars, and poof! We know exactly where we are, and how to get where we want to go.

How does this "global positioning system" (GPS) work? What uses can it be put to? And what sport has it started involving millions of people around the world? Find out here.

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GPS and the Secret Life of the Cat

GPS and the Secret Life of the Cat

Get a cat’s-eye view as 11 kitties wearing cameras and GPS units roam their neighborhoods. They play, catch prey, confront rivals, even upchuck, as you look on. More...

Interactive
BBC
Launchpad: How GPS Works

Launchpad: How GPS Works

With illustrations and animations, an engineer from NASA explains how GPS works. Get the basics here.
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Video
NASA
GPS (Global Positioning System)

GPS (Global Positioning System)

Where are we? That question used to lead to a stop to ask directions or to consult a road map. But not any more. Most people today use a GPS to get around. More...

Article
National Geographic
GPS Receiver Quiz

GPS Receiver Quiz

GPS receivers would have seemed like magic when your parents were teens. Test your knowledge of how they work. More...

Interactive
HowStuffWorks
The Official Global GPS Cache Hunt Site

The Official Global GPS Cache Hunt Site

Geocaching can take you around the world or around your town to places you've never seen before. Here are the full details about getting involved. More...

Article
Groundspeak.com
Do You Know Where You Are?

Do You Know Where You Are?

Geodesy is the science of measuring the Earth. Without it, planes might land beside — not at — airports. Find out how GPS has changed geodesy. More...

Article
NOAA
Geocaching: From the Web to the Woods

Geocaching: From the Web to the Woods

As expert players explain, your GPS will put you within 60 feet of a cache, which might be the size of a fingertip or hidden inside a fencepost.
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Profile
Standford University
GPS Shoe Hotfoots Your Location

GPS Shoe Hotfoots Your Location

You can run but you can't hide! Especially with these sneakers. They track your every move — with a GPS! More...

Video
Discovery
GPS: Frequently Asked Questions

GPS: Frequently Asked Questions

Got a question about the global positioning system? Then check out this FAQ — your question may already have been answered. More...

Profile
GPS.gov
Snow Leopard Fitted with GPS Tag

Snow Leopard Fitted with GPS Tag

How could we find out about mysterious leopards that live deep in the wilderness between Afghanistan and Pakistan? Answer: Attach GPS collars and track them from space. More...

Article
BBC

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