ONE-ARM PROTRACTOR: This protractor features a rotating arm, a compass rose with cardinal directions (N, S, E, W) and intermediate points, and a degree scale (0 to 360) for aligning with the meridian on the chart.

TRANSPARENT BASE: Made of transparent plastic to allow visibility of the chart details beneath it. The clear center mark helps position the protractor precisely on a specific point or location on the chart.

TWO SCALE RATIOS FOR SPECIFIC NEEDS: The scale ratio of 1:200,000 is suitable for larger areas, while the scale ratio of 1:50,000 is ideal for more detailed mapping. With a total length of 17 1/2 inches, this protractor is well-suited for working with larger charts and maps.

INDEX LINE AND BEARING ARM: The protractor includes a central pivot point, an index line for alignment, and a bearing arm for plotting courses and measuring bearings directly.

APPLICATION: This protractor is used for plotting courses and measuring bearings on nautical charts. It is specifically designed for maritime navigation purposes and has a single rotating arm.

PRODUCT NUMBER: FO-1415