GPS in Cellphones/ Smartphones

Cellphones are underestimated. I took a trip the other day and needed directions on the fly. I was out of Crossville and didn't know which way to go, so I turned the GPS capability on in my cellphone, and downloaded a free app from Blackberrys AppWorld and whala! A perfect GPS that talked to me and everything! It showed the estimated time till arrival, the total miles till the destination, etc. I was impressed. Who needs an expensive GPS system when your smartphone can do it all!