
These devices don't work without satellites.
Hard to say what these "satellites" are. FE theories include a combination of land-based towers, and there are in fact many satellites that hang from helium balloons, etc. These devices are known to work though, with HOW they work being a separate consideration. US military, long before the age of satellites, had a system known as LORAN that used towers. Two towers could provide very accurate positioning to sea vessels a thousand miles away. That's actually another pro-FE argument. These things required line of sight and could not have worked over curvature at the distances it did work. Some FE proponents do believe that satellites can rotate around on their own, but dismiss the explanation of how they stay in "orbit". That's actually the belief of the group that produced the video above.