Four global navigation systems share the sky — the American GPS, Russian GLONASS, European Galileo and Chinese BeiDou. Together they’re what lets your phone, your car and the world’s aircraft know exactly where they are. OrbitalNodes tracks all four constellations live.
Unlike the broadband megaconstellations, navigation satellites orbit in medium Earth orbit (MEO) around 20,000 km up — roughly 35–40× higher than the ISS — each taking about half a day to circle the Earth. They’re trackable, but far too high and faint to see with the naked eye. Your phone uses several systems at once: it needs at least four satellites in view to fix a position, and modern phones routinely lock onto 20+ across all four networks.
Live counts update from the satellite catalog · GNSS constellations are very stable, so these change rarely.
Most people say “GPS” the way they say “googling,” but GPS is just one of four global navigation satellite systems (GNSS). The American GPS came first and became the generic name, but Russia’s GLONASS, the European Union’s Galileo and China’s BeiDou now provide independent, sovereign positioning — and the phone in your pocket quietly uses all of them at once.
They all work the same way: each satellite broadcasts an extremely precise time signal from a known orbit. Your receiver listens to several satellites, measures how long each signal took to arrive, and solves for its own position — which is why it needs at least four in view. Having four independent systems means a modern receiver can see 20 or more satellites at any moment, giving faster, more accurate, more reliable fixes, especially in cities where buildings block part of the sky.
The differences are in the details. GLONASS sits at the highest inclination, which improves coverage at extreme latitudes. Galileo — the only system under civilian rather than military control — broadcasts a free High Accuracy Service good to about 20 cm and carries search-and-rescue transponders that detect distress beacons. BeiDou is unique in mixing medium-orbit, geostationary and inclined-geosynchronous satellites, and offers a short-message service that lets users send text through the constellation itself. All four orbit in medium Earth orbit, around 20,000 km up — high enough that a handful cover the whole planet, but far too high and faint to spot by eye.
When you say “GPS,” your phone is usually listening to all four systems at once. Each satellite is essentially a flying atomic clock; your position comes from comparing how long their time signals take to reach you — measured to billionths of a second.
No — GPS is one specific system, operated by the US Space Force. GNSS (Global Navigation Satellite System) is the umbrella term for all of them: GPS (USA), GLONASS (Russia), Galileo (EU) and BeiDou (China). “GPS” just became the generic word for satellite navigation because it came first. Most phones made since about 2020 actually use all four at once.
Almost certainly both — and Galileo and BeiDou too. Modern smartphones contain multi-GNSS chips that automatically combine signals from every system in view. You can often see this in your phone’s diagnostics: it may be locked onto 20–30 satellites across all four networks at once, which is what gives you a fast, accurate fix even between tall buildings.
For free, open signals, Galileo leads: its High Accuracy Service has delivered about 20 cm precision since 2023. GPS follows at around 1 m with a dual-frequency receiver, GLONASS is slightly less precise (~2–4 m) but excels at high latitudes thanks to its steep 64.8° orbit, and BeiDou matches GPS globally and beats it over the Asia-Pacific. In practice, using all four together beats any single system.
Roughly GPS ~31, GLONASS ~24, Galileo ~30 and BeiDou ~35 usable — around 120 across the four global systems, plus regional ones like Japan’s QZSS and India’s NavIC. OrbitalNodes’ live counters show the current catalogued total for each; these constellations are very stable, so the numbers change only occasionally.
Not with the naked eye. Navigation satellites orbit in medium Earth orbit around 20,000 km up — some 35–40 times higher than the ISS — so they’re far too faint and distant to see, even though they’re trackable. The satellites you can spot during twilight (Starlink, the ISS) are a completely different, much lower population.
BeiDou uses a hybrid constellation — mixing medium-orbit, geostationary and inclined-geosynchronous satellites — which strengthens coverage over China and the Asia-Pacific. It’s also the only GNSS with a two-way short-message service: users can send a short text through the satellites themselves, which has been used to call for rescue from areas with no phone signal.