On Friday we asked, what does “Lubber’s Lines” mean and where did the term originate?

According to Origins of Sea Terms, by John G. Rogers, Lubber’s Lines are marks in the bowl of a ship’s compass, aligned for dead ahead, astern, and abeam. The origin of the term may be that an experienced helmsman did not need these aids to ascertain the ship’s heading, and to use them was considered lubberly.