Mapping the Veins of the Earth
Navigation in the Veins of the Earth is a difficult proposition even in the best case. As Skerples puts it in his excellent Veinscrawl (link contains spoilers) supplement: The worst case scenario for a surface hexcrawl — fog at night, no map, unfamiliar and dangerous terrain— sounds like the best case scenario for an underground cave-based hexcrawl. You can’t see terrain in the distance. You probably don't know north from south. You can barely tell where you’ve been. Hostile forces surround you. How can you possibly navigate in this mess? This is a challenge in real life as well. Caves intrinsically resist mapping, and even with modern technology and perfect understanding of a cave (often very challenging to acquire in the first place), there is the difficulty of presentation. For mapping buildings and surface locations, top down maps or isometric maps are common because they do a decent job at matching up to how your brain wants to model that space. Applying the same logic...
