Navigation question???
I had looked at doing this on my C5 before taking the easy way out and installing a Kenwood unit.
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I concur with the other responses on using the aftermarket units. I looked at the Pioneer but at the time there was some serious QA problems so went with a Kenwood head unit. It is my understanding that the Pioneer problems have since been fixed so this would be a better choice since the Nav is built in.
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