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gield
66 days ago
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No GPS required: our app can now locate undergroun...
Waze Beacons [1] do this for car tunnels. Some underground systems, e.g. in Barcelona IIRC, also use BLE beacons to help phones position themselves.
[1]
https://support.google.com/waze/partners/answer/9416071
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[1] https://support.google.com/waze/partners/answer/9416071