> Very different than what? Than system communicating with geostationary sats. Training the circuitry onto one weak, but stable satellite signal is much easie

> Very different than what? Than system communicating with geostationary sats. Training the circuitry onto one weak, but stable satellite signal is much easier than keeping readjusting, or communicting with multiple satellites at once. Just like with the GPS, the trick is the super duper accurate, and stable frequency reference.