Douglas Navigational Protractor 5" - D565 rechargeable aera 6xx Series

aera 6xx Series

which allows you to toggle between the navigation display and backup display modes at the press of a button

which offers the best protection from damaging trees Wrap the strap around a sturdy tree or post and insert the knotted end through the loop end to create a cinch

Overall Length: 5

Contact point set with wrench

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.