elements of navigation and Geography to a sufficient degree,
This passage illustrates how much times have changed. At one point navigation was taught my university professors and now that concept is laughable. We just use google maps. This works into the larger schema of interest in the rockfish gap report because it is such an obvious illustration of how different the times were. It is easy to take for granted the racist attitudes of the day etc but this helps the reader to better understand the time period this document was written in.