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I have the heads-up display, and while the numerical distance readout is often overstated, the bargraph (not sure this is available without the heads-up display) seems to be more accurate. Also, the voice and the display update rate are not entirely in sync - when the display may read 100M, the voice may say 50M, implying less resolution or update rate on the display. Last, it seems to measure to the center of the intersection, and not the stop lines, which can affect the distance to the turn.
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