I have a nagging question from my research into the flat earth society. They are actually a fairly scientific bunch, if you simply ignore certain science. For example, there’s a YouTube where a guy who gets in his truck in Australia and drives a flat road. He starts out explaining how to look up the curve of the earth and if you look at it as an actual straight line extending from where you are, the earth “drops” away from that line. So, he theorizes, as he drives, that drop should register on his GPS. I know he just has the wrong instrument, that if he flew in a jet in that actual straight line, with the gyroscopic device that maintains zero altitude from where it left the ground, he would see that “drop”.
But, here’s the question, how does GPS take into account the curvature? Some sort of triangulation I guess, but what basis is it using for sea level? Is each satellite given an altitude, based on its geosynchronous location? I’m not even sure what I would put in google for this one.