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@patrickcmiller Digitally signed GPS, Galileo, NavIC, and QZSS signals. It would take a major retrofit to a lot of hardware and a lot of copies of some software, but that would address the matter of spoofing. Far from cheap, but probably important before certain tensions escalate.

(Given the current state of geopolitics, it's not advisable for to rely GLONASS or BeiDou outside their respective countries of control if one is not part of the same country's government.)