I assume we can start by agreeing that GPS does indeed work. Your mobile phone or sat nav system know exactly where you are on earth, at all times. It's good enough to use while driving a car, and it has even been used to land airliners. GPS works, regardless of where you are on earth. Personally I have used it in Australia, New Zealand, the USA, Europe, South Africa, and several islands in the middle of the Pacific. I have heard from other who used it in other countries, and have never heard anyone mention any area in which it does not work.
In round earth theories, GPS uses a bunch of satellites, and your phone finds its position by checking the timing of signals from at least 3 of those satellites.
I understand that, according to FE, all satellites are hoaxes. There cannot be anything circling the earth, because the earth is flat. So here is my question:
In FE, what makes GPS work?
Does it use invisible balloons, in sufficient quantity that at least 3 are always visible regardless of where you are on earth? Does it use gigantic transmitters that beam signals around the earth?
Tom Bishop mentions LORAN/eLORAN as being "interoperable with GPS", but that does not explain how my phone, which does not receive LORAN signals, does its trick. In fact, the frequencies used by LORAN are too low for use in a phone - you could not fit a LORAN antenna inside a phone. Also, LORAN has a limited range, and it does not have the accuracy of GPS.
So just how does GPS work according to FE?