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This 250 mm (10-inch) Navigation Protractor is a Douglas-type square pattern tool designed for accurate plotting on marine charts. Suitable for both training and professional navigation work.
Douglas-type square protractor: Allows precise bearing measurement and course plotting
Dual-function design: Can also be used as a simple parallel rule and plotter
250 mm / 10" square format: Offers a stable working area on most chart sizes
Clear graduations: Ensure quick, accurate angle readings during passage planning
Additional 130 mm / 5" size available: Select the format that best fits your chart table
A versatile plotting instrument for reliable course setting and route checking.
