The map contains race course for the long and short races. You can enlarge it by clicking on the upper right item. The upper left item shows you the itinerary, you can filter particular day and study the course, portages and plan your race along with your individual refreshment points. The descriptions are bilingual.
Although we finish this year elsewhere (Husárna instead of Zvíkov), the following videos from 2021 made by Google Earth and GPXes from Mojža Forerunner can give you an insight into what the race and portage are about.
Moreover, during the race Pádluj O106 Mojža made this video from the long portage with some useful instructions.