You can input GPS coorinates and get an exact point. Wikipedia provides you coordinates for pretty much any geographical point or town that you might want to see. It's also handy for getting ahold of a city area, and figuring out which landmarks you can use to navigate around.
I haven't used this thing in ages, I usually used it for to look around the town and check out stuff where I haven't been. Very usefull when you move into a new house and you don't know the area very well, well, it worked for me.