Douglas Navigational Protractor 5" - D565 rechargeable aera 6xx Series
Description
aera 6xx Series
GT20-TM transducer
which allows you to toggle between the navigation display and backup display modes at the press of a button
producing 50% more energy than the Instinct 2 Solar
Douglas Navigational Protractor 5" - D565 rechargeable aera 6xx SeriesCalled "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.
Exchange/Return Notes
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