IRl
Douglas Navigational Protractor 5" - D565
Douglas Navigational Protractor 5" - D565
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Called "navigational" primarily 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. In England and Australia it is more commonly called a Douglas Protractor, where they are popular for general plotting.
