A number of possibilities could be happening. Youtube and the rest of the internet discuss much more about the space hoax than we do. As a curious mind I encourage you to delve into the matter.
It's interesting that you discount the possibility that the earth is actually spherical and satellites are orbiting it and GPS works exactly as all the people who know what they're talking about say it does.
When I was young we didn't have satellite TV or GPS, we had 3 TV channels (much excitement when the 4th started in the UK when I was 8 ) and maps. People weren't marching in the street because of the lack of entertainment or devices which could tell you exactly where you are at any point. How exactly do you think satellite TV came about? Do you think the satellite TV people called NASA and conversation went something like:
NASA: "Hello?"
Sky: "Hello, is that NASA?"
NASA: "Yes"
Sky: "I understand you can put things into orbit?"
NASA: "Er...yes. Yes we can. Piece of cake *stifles giggle*"
Sky: "Great! 'Cos we have this idea for beaming TV into people's homes from a satellite."
NASA: "Right..."
Sky: "So...can you help us with that? We just need a few satellites putting up to beam signals which people will receive via aerials attached to their houses"
NASA: "Umm...we're a bit busy right now..."
Sky: "We're willing to pay Shouldn't be too difficult for you clever chaps, right?"
NASA: "Er...we'll have to get back to you"
And presumably after the phonecall a somewhat panicked conversation took place internally in NASA about how they're going to fake TV signals from "space". As I said in another thread, my TV stopped working when my neighbour put some scaffolding up and blocked the signal. So it IS pointing at something. What do you think that is?
Same with GPS. It demonstrably works. It's crazy what mental backflips you do to try and explain how it can without satellites.
Meanwhile you blindly accept Rowbotham's "proofs" which generally amount to little more than him stating something and then claiming that it is proven because it matches his own observations. Case closed! As I will keep reminding you, we're talking about a man who claimed it was "proven" that the moon is translucent. There is a school of thought which says that this should cast some suspicion on his other "proofs"...