At first we were quite skeptical about the real-time Traffic Data option because one can only wonder how accurate and up-to-date the unit can possibly be. A small traffic antenna included with the unit attaches to the back and can be affixed to either the dash or windshield. Making our way home from a local fabrication shop, we encountered bumper-to-bumper traffic. We plugged in our traffic antenna and it quickly told us that there was something in the road 1 mile ahead of us. The Nav One gave us the option of detouring around whatever was in the road, but we decided we would wait and see if the unit was accurate. Sure enough, there was a couch in the fast lane holding up traffic. Our doubts were certainly put to rest after that.