It sounds to me like you want to keep two sets of records, a map (or set of maps) and a set of notes. Although, drawing the map from an in-world perspective, with the data handwritten where it's relevant, would be pretty cool. I do have a question for you - did any of your numbers come from math regarding circles or globes? Mapping a whole world is very hard, because it is impossible to accurately map a sphere on a 2-dimensional surface. If this is the case, consider doing a few separate overlapping 'region' maps, so you don't have to worry as much about the curvature.

Good luck, and hang in there!