GPS and Modern Navigation

GPS stands for Global Positioning System. It uses satellites in space to help people figure out exactly where they are on Earth. Your phone, car, and many other devices use GPS every day. Before GPS, explorers had to use maps, compasses, and the stars to find their way.

How GPS Works

About 30 GPS satellites orbit Earth at all times. Each satellite sends out signals. A GPS device on the ground picks up signals from several satellites at once. It uses those signals to figure out its exact location. This all happens in less than a second.

GPS and Exploration

GPS has changed the way people explore. Hikers use it to follow trails. Scientists use it to track animals and study glaciers. Rescue teams use it to find people who are lost. Explorers can now know their exact position even in the middle of a desert or ocean.

Fun Facts

• GPS satellites fly about 12,550 miles above Earth.
• The GPS system was first built by the United States military in the 1970s.
• GPS can tell your location within about 10 feet.

Did You Know?

Without GPS, your phone's map app would not be able to show you where you are or give you directions.