The cycle network in the Sauerland and Siegerland-Wittgenstein regions has been divided into a honeycomb structure. At the corners of each honeycomb, "junctions" have been created that connect the honeycombs with each other. From there, it is possible to travel on in several directions. The junctions are numbered consecutively and provide good orientation - so you won't lose your way even without maps. You can find more information at https://www.sauerland-radwelt.de/de/tourenrad/das-konzept-radeln-nach-zahlen