Navigation protractor 360° marked in 1° intervals. Imported from Denmark. $7.95   ...item# 1852

5 inches square

Called "navigational" only because it goes continuously from 0 to 360° as a compass rose does. Use for plotting lines of position in celestial navigation or for general plotting and vector problems on plain paper that does not have a compass rose. See Notes on plotting tools. Note that this protractor is ideal for making a string plotter or "Sutherland Plotter," named after Chuck Sutherland, a kayaker who invented the concept. The protractor has a small hole in the center. Just run a light line (whipping twine or fishing line) through it, about 18 inches long, and tie a knot at both ends. Then you can use this to measure bearings and course lines from a chart. Very slick! Especially valuable for kayaks which have limited storage, but this arrangement is useful enough to be considered for all vessels. Chuck sells a model of this ready made for $5, but he uses a different style protractor (for more info: (215) 453-9084).