[kjar]

if they do it all on device and do not transmit out, then the privacy concern seems squelched. On retail tracking yeah it's messed, practically no one knows their movements are tracked on their phones - cell tower triangulation, GPS, then the kicker NFC. I love / hate tech. It's powerful stuff. [edit] - the cell tower triangulation is forever given the nature of the tech.

[SahAssar]

GPS is passive and NFC is very short range. I think it'd be easier to track people by bluetooth or wifi MAC.

[andrerm]

> all on device and do not transmit out

Like Apple? Retorical question. My point is: this stays in device is just propaganda. It can be done but will never happen

[WanderPanda]

Cell tower is rather trilateration, right?

[grenoire]

I believe the scale is too small for height to make an impact.