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A comment on No GPS required: our app can now locate underground trains. Parent comment

Re:No GPS required: our app can now locate underground trains by gield on Wednesday November 13, 2024 @04:49AM (#42124542)
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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