Plotting Tool Set


This 3-pack Weems & Plath plotting tool set comes with the Protractor Triangle, Roll Plotter, and Ultralight Dividers/ Compass.

Effective 2/15/2022: These required items for the Captain Course (OUPV/Master up to 100 Tons) are loaned to all students in our classroom course, and therefore not required to purchase IF you are attending the classroom session.



This set comes with (3) navigation plotting tools: triangle, roll plotter, and dividers.

The Weems & Plath Protractor Triangle with handle is larger than other navigation triangles on the market, with sides that are 9-1/4 inches (23.50cm) long and a hypotenuse (long side) 13-inches (33.02cm) long. Its clean, uncluttered design is inscribed with contrast enhancing colors (red & black) that display both 320mm & 1-80,000 scales. A hole located at the vertex allows the user to convert the protractor into a quadrant to measure altitude or angle. The triangle is constructed of heavy duty clear 5 mm thick acrylic for durability, with a handle for ease of use. The handle also holds a pencil, and both pencil and pencil sharpener are included.

The Weems & Plath roll plotter consists of a plotter mounted on a roller. The plotter contains distance scales at 1:20,000, 1:40,000, and 1:80,000 to fit the N.O.S. Coast and Harbor Charts, as well as an inch scale. Included are a semi-circular protractor for measuring courses and bearings against a meridian on the chart, and two quarter circle protractors for measuring courses and bearings against a parallel of latitude. Courses and parallel lines are transferred and kept parallel by means of two rollers which are mounted on a slide axis. Used for measuring or laying off courses and distances on a nautical chart. Instructions included. Dims: 3.5″ x 12.5″.

The Weems & Plath dividers weigh only 3 oz. and are heftier than standard size dividers. Made in Germany of a coated marine alloy to resist corrosion. Gear synchronized arms allow one-hand use and provide excellent point alignment, while the center wheel/extension bar construction allows for fast action and precision adjustments. The Weems & Plath Ultralight features hardened stainless steel points and is fully adjustable. Replace a point with lead (supplied), and it becomes a navigator’s compass. Length 7″.


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