Does GNSS chipsets in phones really support two way communication? Sounds like something that would need specialized antennas and high output power, not exactl

Does GNSS chipsets in phones really support two way communication? Sounds like something that would need specialized antennas and high output power, not exactly something that can be hidden at least. Galileo also supports or maybe will support emergency beacons from the ground. https://www.esa.int/Applications/Navigation/Galileo/Galileo_services https://www.esa.int/Applications/Navigation/Galileo/Galileo_...