If you search the forum on the GPS topic, you'll find that the nav system in the 2003 Maserati (mine is a 2003) is a piece of junk. I'm also in the Northeast US, and the GPS was useless. It required that I search by *township*, not city or town, it only showed the street you were traveling on (not the detailed street map), and it is now so hopelessly out of date that it was of net zero value.
I highly recommend getting a Garmin Nuvi, which will not only give you a great GPS with up-to-date maps (and, depending on which one you get, voice commands), but also a workable hands-free bluetooth speakerphone, which again, is lacking on the 2003 US-spec Maseratis.
Short summary - don't waste your time or money on the Nav CD.