I think if you live in a place where the population for the state is 1 million, then I dont really think a nav system is necessary, but when you get to the crowded states, a nav would be very beneficial. Yeah try San Fran or LA or even New York with a map!!! hahahaah I dont want to go up and down a street find some small little store when it would just beep in my car when I am at the location