Are you taking a navigation or chart plotting course? I have the tools left over from when I took the courses. I have the Weems Parallel Plotter, the Course Protractor Plotter by C-Thru ruler Company and the West Marine Solid Brass One Hand Deluxe Dividers. I also have the text "The Weekend Navigator" by Bob Sweet and the Eighth Edition of the Richardsons Chartbook and Cruising Guide for Lake Michigan.