I wrote about it recently here, but in relation to Interstellar and Japanese clocks. Probably.

http://www.thewatchnerd.co.uk/interstellar-soundtrack/

Quote Originally Posted by bitfield View Post
This is really interesting, because GPS satellites are affected by both special and general relativity—in different directions!

Special relativity says that if you travel fast (relative to someone else) your clock runs slow (relative to someone else's). Satellites are going a lot faster than we are, so this effect is detectable.

However, general relativity says that if you're in a lower gravity field than someone else, then your clock appears to run fast (relative to someone else's). Satellites are further away from the Earth than we are, so they experience less gravity.

So which of Einstein's theories wins? It turns out the speed-up effect of general relativity is about six times bigger than the slow-down effect of special relativity. So, as you say, the atomic clocks aboard GPS birds are adjusted to take account of this. If they weren't, the error in ground position would be very serious.