[renjimen]

I thought the same, but they're actually below geostationary orbit. They have 12 hour orbits. Also, they don't orbit the equator, which is required for a geostationary orbit. See my comment above with more details.

[mardifoufs]

I think this article, that most here have probably read or heard about considering how popular it was on HN, explains why quite well! It is a very long article though (which is awesome, imo!). The whole thing is an incredible primer on GPS .

[numbol]

wow that is cool! Thank you for that clarification looks like geostationary used for stuff like https://en.wikipedia.org/wiki/Quasi-Zenith_Satellite_System