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There is no substitute for a factory nav system. Anything less is an excuse for what GM should have made available. Offer it & for those of you who don't want to spend the money, don't buy it. I have had factory nav systems (6 GM/1 Jeep) in the last 7 vehicles purchased. They are worth every dime, even with turn by turn instructions. We live in the world of technology = give us the blasted option!
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