Each vehicle position should have a corresponding timestamp when the
GPS reading was made. When the feed reaches a consumer it is already
somewhat stale, so it is normal to have stale data in the system. When
you send the realtime data to google you will get the feed issues
report from which you will learn that (2) == (1). You should send (3)
if you want the realtime data to be presented to the user. Google
doesn't predict the location of a vehicle, just arrival/departure
times based on the latest available GPS location. That's why it is
important to have the correct timestamp for the GPS reading.
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