ATP-3-09-02 Field Artillery Survey Download
Page 95 of 168
Survey Methods 16 February 2016 ATP 3-09.02 7-7 Figure 7-3. Simultaneous observation 2 7-25. At the master station, the measured horizontal angle is added to the known azimuth to the mark to determine the azimuth to the sun. The grid coordinates of the master station, the vertical angle to the sun, and the grid azimuth of the sun are transmitted to each flank station. The flank station operator plots on his map a line representing the azimuth from the master station to the celestial body. From the flank station, a line is drawn perpendicular to the line representing the azimuth from the master station to the celestial body (see Figure 7-3). The flank station observer then determines the correction to be applied to the azimuth from the master station to the celestial body. When this correction is applied (added or subtracted), the result is the azimuth from the flank station to the celestial body. The correction is determined by using the correction nomograph in figure 7-4 on page 7-8.