rhumb lines are useful in any map where the angles are preserved in the projection. Projecting a 3-d surface onto a 2-d format always creates some kind of deformation. These deformation are most easily described as angular, areal, and distance. Typically if there is a compas rose with graticule that is rectangular, then angles have been preserved for that map. For the purposes of this map, directionality have been preserved. I probably should have preserved distance since the map is about traveling, but the area is pretty small so there is little difference in distance... hopefully.

I have been doing some hand work on ity so far and have not had a chance to scan and digitize as of yet. I hope to have another WiP tage in a day or so.