never used it.

side story: Received a promo email from Onstar last week about using their turn by turn voice navigation.... i responded saying "no thanks, my vette has a navigation system". Onstar knows everything about my car, yet, they ignore it in search of making more money... why would i use onstar when I have the GM nav system?

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You have your way. I have my way. As for the right way, the correct way, and the only way, it does not exist.