Can you see GPS satellites from the ground?

Not with the naked eye. At 20,200 km altitude GPS satellites are far too distant and faint to see without equipment, unlike the ISS or a fresh Starlink train in low Earth orbit. You can, however, watch their positions in real time on a live 3D satellite tracker.

Explainer · live tracker

How many GPS satellites are there?

Q: How many GPS satellites are there?

The U.S. GPS constellation is designed around 24 core satellites but typically operates with about 31 active satellites to provide redundancy and better coverage. They are arranged in six orbital planes, so that at least four satellites are visible from almost anywhere on Earth at any time — the minimum needed to compute a position.

Q: How high do GPS satellites orbit?

GPS satellites orbit in medium Earth orbit (MEO) at an altitude of about 20,200 km, completing one orbit roughly every 12 hours. This is far higher than the ISS (~400 km) or Starlink (~550 km), but lower than geostationary satellites (~35,786 km).

Q: What are Galileo, GLONASS and BeiDou?

They are the other global navigation satellite systems (GNSS): Galileo is operated by the European Union, GLONASS by Russia, and BeiDou by China. Together with the U.S. GPS they provide overlapping global positioning coverage, and modern receivers often use signals from several systems at once for better accuracy.

The U.S. GPS constellation is built around 24 core satellites but usually runs about 31 active satellites for redundancy and coverage — arranged so at least four are visible from almost anywhere on Earth at all times. Here's how the constellation works, its orbit, the other global navigation systems, and a live tracker showing every navigation satellite right now.

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The GPS constellation, in brief

GPS (the Global Positioning System) is operated by the U.S. Space Force. Its ~31 active satellites sit in six orbital planes tilted 55° to the equator, spaced so that a receiver on the ground can almost always "see" the four satellites it needs to solve for latitude, longitude, altitude, and time. Extra satellites beyond the core 24 improve accuracy and provide backups.

How high — and how it works

GPS satellites orbit in medium Earth orbit (MEO) at about 20,200 km, circling Earth roughly every 12 hours — much higher than the ISS (~400 km) or Starlink (~550 km), but well below geostationary orbit (~35,786 km). Each satellite continuously broadcasts its precise position and an atomic-clock timestamp; your device measures the tiny time differences between signals from several satellites and triangulates its location.

The other navigation systems (GNSS)

GPS is one of several global navigation satellite systems. Galileo (European Union), GLONASS (Russia), and BeiDou (China) each run their own constellations, and modern phones combine signals from several at once for better accuracy in cities and canyons. Together these systems put well over 100 navigation satellites in MEO.

See them live

Although GPS satellites are too high and faint to see with the naked eye, you can watch their real positions on the SkyLens live tracker — filter by operator or mission type to isolate GPS and the other GNSS constellations on the 3D globe. To understand orbital regimes and how tracking works, see Learn Space.