It's the geodata.
Scroll down on the page and you come to a section on geodata. The organizers are making a bunch of data for the competition areas available. You can download that data and make your own map of the area. And the geodata comes from:https://mapmagic.dk/
Ulrik Nielsen created MapMagic. Ulrik is an Orienteer Kansas member. He lived in Lawrence for less than a year. While he was here, he mapped West Campus. He's also Ulrik of "Ulrik's Hill."