[CamperBob2]

At no point is velocity differentiated when computing a GPS fix. (Or integrated, which may be what you meant.)

Your point stands, though... the way it does work is pretty much indistinguishable from magic, from a 1970s perspective. Those guys were wizards.

[rx_tx]

If you want to understand GPS more, https://ciechanow.ski/gps/ is always an amazing read, witchcraft confirmed.