I love the D3 however as a Navi unit it stinks, my Garmen C330 blows it away. I live in South Elgin, IL, my D3 has no clue what most of the OLD streets are let alone the newer ones, the newer ones a new map DVD can cure, but the old ones? Nope, also it maps out the worst way to go no matter how I set it. I was going to sell my Garmin, now I'm keeping it so until I figure out how to correct the D3's Navi flaws I have something accurate to use.