Reading comprehension, please.
They are talking about (a decade ago) just how precise GPS survey equipment is. Meaning even then (and without Glonass, Beidou, or Galileo) they could get VERY accurate results.
Coming from someone like you who can't grasp what is being said or read links, nor understand how a GPS tells you where you are, nor what triangulation is, I'm perfectly fine with that.
If you still have problems, here's an easy-to-understand link (and why I talked about "spokes" as a way of illustrating it:
https://www.nationalgeographic.org/p...ulation-sized/
https://www.nationalgeographic.org/p...ulation-sized/