At least for maritime terminal many of them can use external GPS source, so it is very simple to spoof GPS. However, that would also mean the terminal would con

At least for maritime terminal many of them can use external GPS source, so it is very simple to spoof GPS. However, that would also mean the terminal would connect to the satellite on wrong frequency as it would think it is in a spot beam it is not and as such you would get crappy signal or no signal at all. That said, many geo-satellites spot beams are the size of Ukraine, so it doesn't matter that much if you just need to move your position a kilometer or two.