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A comment on Why Hong Kong protesters didn't use their own metro cards. Parent comment

Re:Why Hong Kong protesters didn't use their own metro cards by bt3 on Sunday June 23, 2019 @11:24PM (#20260230)
Metro station are typically underground as well. So even a very precise triangulation could place you logically in a building above ground.
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Re:Why Hong Kong protesters didn't use their own metro cards by inferiorhuman on Monday June 24, 2019 @12:47AM (#20260629)
Unless there are bluetooth beacons or cell repeaters underground.
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