GPS is a kinda funny thing... Around my area (New England) I know every highway and biway there is. Travelling abroad it's easy to use a map, and when I was in the mountains I used it (Old style, got the Lat and Long and looked at a map) and after I knew where I was , it was like "Um... ok.. I don't feel anybetter"
GPS tells you where you are, but it doesn't affect where you're going.
That said, Garmin.
-> Steve