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Why won't the turn by turn directions from OnStar show up on HUD? My understanding is that directions from the NAV show up on HUD. Really makes no sense to me since the radio station and song from XM, radio station on AM/FM, and either a DVD or CD show up on HUD. Why not Onstar diections which show on the stereo display?
 

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It was not a function that was approved, because it does it on the DIC. It should be a future enhancement. It was mainly done because so few vehicles have HUD.
 
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