What GPS is
GPS, short for the Global Positioning System, is a satellite-based navigation system that allows a receiver to determine its location anywhere on or near the Earth. It works by using signals broadcast from a network of satellites orbiting the planet. As long as a receiver can pick up enough of these signals, it can calculate where it is. GPS has become a standard feature in phones, cars, and countless other devices.
The satellites
GPS relies on a group of satellites that orbit the Earth and continuously broadcast signals. These satellites are arranged so that, from most places on the surface, several of them are above the horizon at any given time. Each satellite sends out information that includes the time the signal was sent and details about the satellite's position. A receiver on the ground listens for these broadcasts to work out its own location.
How GPS finds your position
A GPS receiver determines its location by measuring how long signals take to arrive from several satellites. Because the signals travel at a known speed, the travel time reveals the distance to each satellite. By combining the distances to multiple satellites whose positions are known, the receiver can calculate its own position. Using signals from several satellites at once lets it pin down location in three dimensions.
Why several satellites are needed
Determining a precise position requires signals from several satellites at the same time. Each additional satellite narrows down where the receiver can be. With signals from enough satellites, the receiver can calculate not just latitude and longitude but also altitude. This is why GPS devices work best with a clear view of the sky, where they can receive signals from as many satellites as possible without obstruction.
Where GPS is used
GPS is used in an enormous range of applications. It powers the navigation apps on smartphones, the guidance systems in vehicles, and location features in fitness trackers and cameras. Beyond everyday consumer use, it supports mapping, transportation, agriculture, and many scientific and industrial tasks. The ability to know precise location and time almost anywhere has made GPS one of the most widely used technologies in modern life.
Why it matters
GPS transformed how people and machines navigate and keep time, making accurate positioning available almost everywhere. Understanding what GPS is - a system that uses satellite signals to calculate location - clarifies how the maps and location features in everyday devices actually work. For anyone curious about the technology behind navigation, GPS is a fundamental concept to understand.
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See also: What is NFC and how tap-to-pay works, What is a touchscreen? Explained.
Sources
Published date reflects the original event date (2023-03-21). This article is original Skillo editorial written from the sources above; facts were verified in September 2026.
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