It's really simple one look at the DVD and you will see the map file alone is larger than the CD's storage capability (Note: this statement valid for large countries/continents such as USA or Europe, not valid for small countries ie Singapore, Australia, New Zealand).

I could add in other issues like the map format and file format is different - but we don't even need to go there, as it simply won't fit as I believe you're in the USA.

So it's a no go - you have to buy a CD-map applicable to your region of the world for use in a Mk3.