Originally Posted by
Looigi
Garmin 500 or 705. The 705 if you want/need on-board maps and turn by turn guidance. Even with the 500 you can plan a route, download it to the 500, and follow it on the screen, though no roads will be depicted and there are no turn warnings or instructions.
And since you got a Madone, you're going to want the slick Duo-Trap ANT+ wheel and cadence sensor that mounts in the left chainstay. It's speaks Garmin.
What do you mean when you say you can follow it on the screen? This summer I'll be cycling across America to raise money for a cancer charity, and it just occurred to me turn by turn directions might be a nice thing to have.