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gps arrival time

  1. E90/E91/E92/E93 (2006 - 2013)
    This is mostly a technical curiosity, but can anyone explain how the TI system works? Where (and who) does the info come from. While I'm at it, how does the GPS compute ETA? It appears to be using my current speed and applying it to the miles remaining. (My ETA fluctuates with my speed.)...