Funny - JD Power just sent me a survey this morning regarding the CX9 Nav. I have a Garmin too, and I like it more than the CX9 Nav. I like how the CX9 integrates with the radio, rear camera, etc., but it's not nearly as intuitive as the Garmin and doesn't have some of the neat features like current speed (also has far less POIs and more expensive and less current map updates). The CX9 nav does have quite a bit of flexibility in terms of display options though once you figure out how to work it, plus I like the bigger screen. The one thing I really wish I could do is enter a destination while driving via voice recognition. That's about my only real gripe - other than that, I can deal with it.
All that and I have no answer to your question! However, I think the answer is no, the CX9 nav does not include that functionality.