Breton course plotters Portland course plotter Kits and our budget chartwork kits which consist of a Blundell Harling course plotter and a set of 7 inch straight brass dividers, are a popular choice for the yachting and sailing fraternity. We also stock a professional navigator’s plotter that incorporates a protractor and pointing arm. All plotters are made in England and are made of UV resistant acrylic a must if your plotter remains on the chart table exposed to the sun. . Click on the image to the left or here to see the full range of chart work instruments available in store.