is the elevation graph on the map page always green?
This screen:
shows the next 2 miles given it shows 0.5mile on the scale.
Sorry 
bad example.
Here is one from a bug report I filed (wrong gradient):
From jonedwards Wahoo screen, it seems he wants to see the terrain changes under the map. I’ve not tried to do that, but that is available and might be able to create a custom screen with map and elevation profile. Or there might be something on Connect IQ. Or it already does it and I missed it due to map screen ignorance.