A good GPS is as far ahead of a smart phone that a smart phone is ahead of a paper map. All will work to keep you from getting lost and find routes. I use Micro Soft Streets and Maps together with Google Earth on my home computer to plan and route my trip turn by turn. Not what a program suggest as curvy roads but what I choose from looking at Google Earth and every road/turn. Then I rebuild/transfer to Base Camp and download it into my Zumo. E-mailing it or sharing in person via blue tooth to additional riders going on the trip is possible. Additionally if you are shown or find a road you like it is easily saved and can be incorporated into a future trip. The amount of information provided with ease can not be duplicated on the small screen of a phone.