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Originally Posted by rchern  Aside from the fact that the CTS screen pops up and the STS screen is in the dash I would think that both factory systems have the same technology and features. |
I think that the CTS nav is "advanced," relative to the STS system. It resides on the HDD, rather than a permanently installed DVD, so it should be faster. I trust that folks with more knowledge/experience than I have will enumerate other differences between the two systems.