system
Given the following post, respond as if you're commenting on Reddit:
human
How can 30-40 GPS satellites cover all of the world's GPS needs?

So, I've always wondered how GPS satellites work (albeit I know the basics, I suppose) and yet I still cannot find an answer on google regarding my question. How can they cover so many signals, so many GPS-related needs with so few satellites? Do they not have a limit?

I mean, Elon is sending way more up just for satellite internet, if I am correct. Can someone please explain this to me?

Disclaimer: First ever post here, one of the first posts/threads I've ever made. Sorry if something isn't correct. Also wasn't sure about the flair, although I hope Engineering covers it. Didn't think Astronomy would fit, but idk. It's "multiple fields" of science. 

And ~ thank you!
gpt
The satellites don't have 2-way communication with devices, all the satellites do is broadcast a signal announcing where the satellite is and what time it is there.  Our devices just listen to these broadcasts and do the math themselves to figure out where they are based on the time it takes for the signal to arrive from each satellite.

The satellites have no idea who's listening and aren't affected at all by it.