Comment Re:NOT "network timekeeping", just timekeeping (Score 2) 166
Remember that the bag's Zigbee radio is broadcasting the bag's location constantly in real time, whereas the child's embedded GPS transceiver is using an accelerometer to help predict when the child will zip across the roadway; plus the child's Wi-Fi chip, network path, etc., will all add latency. If that child's GPS receiver has lost signal due to interference, it's going to need to rely on inertial navigation and its own free-running clock to send the predictions of future locations to the car, and those might be out of sync, depending on how long the child has spent in the basement.
Oh, wait. Children aren't having embedded ADS-B chips surgically implanted yet? And random trash bags don't have Zigbee? Hasn't someone been thinking of the children?