An updated version of the Breton or Portland Plotters, the Weems Protractor has a movable compass rose grid that can be used to lay off a course or bearing, measure distance between any two points, plot position on a chart from a given set of coordinates, or determine coordinates of position on a chart. 

• Updated version of Breton & Portland Plotters
• Movable compass rose grid
• Edges graduated in nautical miles: 1:20,000; 1:40,000; 1:80,000
• Pencil & sharpener included
• Lifetime warranty