I was thinking of getting the 3 year US database subscription. I haven't used it before (other than the month trial it comes with, I believe). I do go out often on unfamiliar roads, and most of the time I cruise fairly fast. Would the database be a good tool, or should I just sit out on it?
Also, is the subscription per unit/serial? I have two 9500ix's (mine and my fathers). Would I need two subscriptions or just one would be enough?