Thanks for both of your replies! Chuckerton's grid method could work fairly well paired with an in-game book or piece of paper . . . if the black dye necessary for ink wasn't unobtainable in homo sapiens. Unfortunately, I lack the desk space to comfortably use graph paper IRL. I'll definitely look into mods, such as Mapper by Genhis. I'll also probably install Dye, Coal, Dye by Tophie, which allows black dye to be made from charcoal.