Weems & Plath Chart Protractor

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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 betwee n 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 Show more