Originally Posted by
gr8ful_rydr
I Exactly what data would I be giving up if I decided to return the Edge 705 ad get a Power Tap? .
since you still have the 305, I don't think any (although not an expert on Garmins).
Asuming no Garmin, you'd give up altitude, a really really fancy "compass" to find your way home, and a little graphic of the path you rode.
On the other hand you'd be gaining data that actually can be applied to make you faster.