Global Positioning System (GPS)

space technology · navigation · satellites

Satellites in space. GPS works using about 30 satellites orbiting Earth. These satellites constantly send out radio signals that GPS receivers (like those in phones or cars) pick up to figure out exactly where you are.

Works anywhere on Earth. As long as you have a clear view of the sky, GPS can pinpoint your location whether you're hiking in a forest, driving in a city, or sailing on the ocean. It doesn't need the internet or phone service to work.

Created by the US military. The United States Space Force built and still controls GPS, but they let everyone use it for free, from emergency responders to video game players to hikers finding their way.

Tells time too. GPS doesn't just show where you are; it also provides super-accurate time information. Banks, power companies, and other important services depend on GPS to keep everything synchronized.

Powers everyday life. You use GPS every time you use Google Maps, play location-based games, or ride in a taxi. It's become so important that modern phones and cars are built around it.