Not sure if this will help but. I have a iPhone 3Gs and bought a Garmin 60CSX and a Garmin 62s. I started with my iPhone and the $9.99 geo app. The phone is ok but the problems I found where poor battery life and very slow to refresh. I got sick and tired of walking past GZ only to have the iPhone catch up and show its behind me. I bought a 60CSX from Costco because it was only $219 and I figured the lack of paperless caching would be ok because I have a iphone to look up stuff. Ya, that proves to be ok, but kinda a pain going between the two. So I bought the 62s and compared all three. The iphone will get you there finally when it catches up. The 62s did a better job in my opinion of getting closer to GZ than the 60CSX. Not having to keep the GPS flat to read the compass also proved helpful on the 62s. The paperless caching works well on the 62s and had me going to the iPhone less and less. I didn't intend to return the 60CSX when I bought it and I know its kinda a sucky thing to do to retail stores but I retuned the 60CSX and primarily use only my 62s and am very happy. So ya, the long and short of it is, if you think you will be doing this for awhile, invest in a good GPS.