Weems & Plath 133 Course Plotter

Weems & Plath 133 Course Plotter

This Course Plotter has a semi-circular protractor scaled from 180° to 360° inside. The lower edge of the course plotter scales 1:80,000 and 1:40,000 to accommodate National Ocean Survey charts. For north and south courses, a small auxiliary protractor scale is printed inside larger one on the course plotter and is used against parallel latitude. The upper edge of the Course Plotter is scaled 1 inch equal to 20 miles to accommodate VP-OS Universal Plotting Sheets.