With the I-pilot link you will have the ability to update the software in the I-pilot......for instance if they improve the spot lock.

You will also be able to save recorded tracks to your unit and you will be able to create your own tracks on the unit without having to record the track with the I-pilot. You will be able to tell it to go to a waypoint ....etc. There are more involved than just the follow the contour feature.
You would also be able to use Autochart to do your own map.....and then use it to follow the contour.