Navigation is retained in you A/V equipment, not your ECU. That said, I went from a 2009 ECU to a 2010 ECU due to issues with my original and had zero issues. I imagine as long as you get a 2017 manual ECU you will be fine and covered your bases on nothing going bad. You can also call a dealership or two and inquire. I've done that a few times, literally called about six or seven dealerships across the US just to get multiple options (or at least someone to answer the question). Believe it or not you will eventually find a tech or service writer somewhere that will try to help you just to be nice.
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2009 G37X | 326 AWHP | 264 AWTQ
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