ELI5: Explain Like I'm 5

How GPS work?

GPS stands for Global Positioning System, and it is a way to figure out exactly where something is located. GPS works by using satellites in space that send information down to earth. Satellites use really precise clocks to measure how long it takes for a signal to travel from the satellite to something on the ground. Using this information, devices on the ground like a phone or car can calculate exactly where they are.