I have both and the Garmin 305 is much more accurate.
RunKeeper profile: http://runkeeper.com/user/teresapsy/profile
I have been using Runkeeper on my iphone 4S along with my Garmin 205 and I have found that the 205 by the end of a 7 mile run was 200m short compared to the Runkeeper. Therefore Im not sure which is accurate ?!?! any advice anyone - thankyou !
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