Elevation chart for navigation

Hi,

I like this elevation chart (data field):

http://apps.garmin.com/en-US/apps/0bbabaa9-aedf-44e8-913b-60e4198be083

What I would like to have is a chart showing the past *and* future elevation if you are navigating along a route.

In principle, the route should contain the alt information, do you know whether it is possible to read this information using the API?

Regards,
Stefan