Does the NA map have enough detail to justify buying a 2GB card to use it over the US/Canada map? I've only used my v4 for one long trip so far, and it was accurate 90% of the time (went a little nuts on a long stretch of highway, urging me to make my way out of the middle-of-nothingness I was in on the screen and back onto the highway for several minutes until it righted itself). It also wanted me to turn the wrong way on a street of my destination, which would've taken me down a dirt road -- used the ol' common sense to do the opposite and make it to my destination. I also noticed on the highway that it was curving along with the actual road, but it was either showing exits that weren't there, or not showing exits that were there -- and this isn't a new highway with new exits or closed exits. This was in somewhat rural Arkansas, so maybe that has something to do with it.
Any idea of the NA map would help with this or any other trips in the future?
BTW -- other than the map glitches and the occasional questionable route, this thing is awesome.
