IMPA 371001 371002 371007Weems & PlathA parallel ruler is used to determine the direction of a course plotted on a chart. The ruler is walked from the course line to the nearest compass rose. The course heading can then be determined.15" Brass ArmsSolid brass arms and handles.1/8" (4 mm) thickness; 15" (381 mm) length.Wt: 7 oz. (199 g).
Navigation Parallel Ruller