I don't think the OP will need to zoom in much for detail. The D80 route around Cap Corse is one continuous loop, the big picture should be fine. The OP was more concerned with elevation gain thus my suggestion to check the admittedly crude chevrons on the paper map. I see nothing greater that single chevrons indicating 5-9% grades. Maybe gauvin's bRouter app will work better for him.
Take a ride with the
Google Street View guy. It looks like a classic loop!