4 ms·

That was my guess as well...geolocation, I mean. A major problem, to me, would be that the GPS in your phone doesn't usually work so well when it is buried dee

• a-priori 17y ago
  I think the time stamp is more important for matching devices. In fact, theoretically, with an accurate enough time stamp you wouldn't need a location to match the devices virtually all the time. Another idea I had would be to tell the users to knock the devices together twice. That way, you would have another dimension for matching devices: the interval between the knocks should be the same, and that doesn't depend on the clocks being synchronized on the two devices.