We get the point you're trying to make. What you don't seem to get, is how insanely stupid that point is.
We have a working explanation, down to the nitty gritty details, of how gps works, and that entire explanation requires the earth to be round. You are suggesting that a type of gps could theoretically be done on a flat earth, and that is in theory true. But as I've said many times, no one should take that suggestion seriously without a complete explanation for how it would work. Not bits and pieces that are random thoughts along the lines of, well you could do this or that. A complete framework that actually explains how all parts of it work - not one or two little pieces, the entire system, including some sort of explanation for how the signals are being faked (which I do believe is practically impossible because to do so you would need to know the location of the receiver to fake a signal of a working satellite.)
Its like if I told you we know our big picture understanding of thermodynamics is correct, because it allows us to build internal combustion engines that power cars, and you said, well, actually, its possible there are little fairies that push cars and we don't know thats not the case, so your argument that it has to be thermodynamics is retarded. The suggestions you are putting out are so insanely stupid that no one should take them seriously. So, yes, we get the point you're trying to make, its just that you don't seem to understand just how stupid it is.