Circumpolar Method for Determining Azimuth.
Research note Oct 80-Apr 82,
ARMY ENGINEER TOPOGRAPHIC LABS FORT BELVOIR VA
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A new reticle, designed especially for the M2-A2 Aiming Circle, enables an operator to determine north without the need for star tables, timing equipment, or computations. This method uses three circumpolar stars alpha Ursae Minoris, and 43 Cephei. The reticle has three concentric circles, one for each star. When the aiming circles telescope is adjusted so that the circles are positioned on their respective stars, the telescope is alined north. The azimuth to a ground object can then be determined with the aiming circle. A similar reticle has been designed for use in the southern hemisphere. This method requires less than 2 minutes, providing an error of less than 2 mils, and only 20 minutes additional training for operators of the M2-A2 Aiming Circle. Author
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