Also, pseudolites or stratellites don't solve the problem I posted - that the experienced areas-of-visibility of real-life 'lites match the coverage areas predicted by spherical geometry on a round Earth, while projecting the same coverage area on a disk map yields an unexplained shape (basically a distorted half-circle rouded at its 2 "corners"). Any kind of (near-isotropically radiating) 'lite will produce a coverage/visibility area with a circular boundary on a spherical projection (round Earth), even actual known ground pseudolites like Hungary's Antenna Digital. On the other hand, no theoretical 'lite can produce the expected "half-circle" visibility area on a plane with the North Pole at the center (flat Earth).