Lieutenant Commander C. H. Blair

Peer Reviewed

Abstract: If you sometimes become irritated at conventional methods of plotting bearings, the protractor discussed in this article will be a welcome addition to your navigator’s kit. This protractor consists of a pair of transparent 45 degree right triangles, each engraved with one half of a compass rose and fitted with a small knob or handle. Figure 1 shows one of a pair, the other being identical. With these triangles the navigator can plot courses and bearings, measure angles, advance lines of position, and plot star sights more conveniently than with usual instruments. The system, used in the German Navy and possibly elsewhere, is simple.
Published in: NAVIGATION: Journal of the Institute of Navigation, Volume 5, Number 2
Pages: 102 - 105
Cite this article: Blair, Lieutenant Commander C. H., "AN IMPROVED PROTRACTOR", NAVIGATION: Journal of The Institute of Navigation, Vol. 5, No. 2, 1956, pp. 102-105.
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