GPS (along with the other major navigation satellite constellations) are in Medium Earth Orbit.
LEO is about to become a lot more crowded, thanks to cheaper launch costs and miniaturisation. What was previously done with MEO and GEO satellites can now be done with LEO constellations, with the advantages of being closer to earth.
Some proposed constellations in LEO number in the thousands of satellites, which is unprecedented:
https://en.wikipedia.org/wiki/Satellite_constellation#Commun...