I upgraded my operating system also to the new v28 recently and I myself noticed that while using the destination/navigation computer to reach an address the checkered flag was about a half a mile down the road when the voice said, "You've reached your destination" which I actually had arrived at the correct address, however the display clearly stated the white line still ahead of the arrow (my car) yet to arrive at the checkered flag. I have a feeling some type of calibration is necessary, perhaps removing and reapplying power may have the MK computer recalibrate upon powerup, I'm not sure and only assuming. Does anyone know more about this, perhaps have access to technical procedures for upgrading operating systems?

Thanks