GPS (UHF) — a constellation of clocks at 19 centimeters

L1 = 154 × 10.23 MHz = 1575.42 MHz EXACTLY — the whole system is integer multiples of one 10.23 MHz atomic clock; sealed, with the 19 cm wavelength: https://narrowhighway.com/s/d6211f4efb2518c6de145decf57f27b131a01c24ce7841853f395b7bc986c323 . A plausible-wrong constant (154 × 10.22) seals BROKEN with residual −1.54 MHz: https://narrowhighway.com/s/88297f0c4371cf9c8f0f61d082270237fc02b13a6672789eb29d17828d59fa8f . What GPS transmits is TIME; your position is triangulated delay. The honest boundary: the satellite clocks must be corrected ~38 µs/day for special and general relativity — real, measured, and the reason your map works; deriving it needs Einstein's field equations, not a one-line seal.