It probably does not need to be perfect. It needs to get R0 below 1. Highly frequented public places can get indoor GPS beacons.
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Every phone could just as well do this offline on device.
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That would work in a world where everyone was trustworthy and conscientious.
End of conversation
New conversation -
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You could have regional “hubs” with a hand-over protocol to more centralized database for those who need to travel larger distances. GSM or air traffic control do not operate with a central system.
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