ATP-3-09-02 Field Artillery Survey Download
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Chapter 7 7-6 ATP 3-09.02 16 February 2016 Figure 7-2. Simultaneous observation 1 7-24. An observing instrument is set up at the master station and oriented on the azimuth mark. An observing instrument is set up at each flank station and oriented on a reference mark to which the azimuth is required (see figure 7-3 on page 7-7). The observing instrument at the master station must be of equal order as, or higher order than the instrument used at the flank station. A prominent celestial body is selected by the observer at the master station and identified to the observer at each flank station. On command, an assistant will key the microphone so the observer can transmit information at the same time he observes a celestial body. A headset, loudspeaker, or other device must be provided for the observer at each flank station so he can hear instructions from the observer at the master station. When all stations are ready to observe, the master station observer announces READY, START TRACKING (countdown), TIP. Each flank station observer, when observing a star, places the vertical cross hair of his instrument on the star and keeps it there by using the horizontal recording motion tangent screw. When observing the sun, he centers the sun inside the solar circle. He keeps it centered by using the tangent screws. The master station observer announces TIP at the instant the star is at the intersection of the cross hairs or when the sun is centered in the solar circle. The observer at the master station records the readings on the horizontal and vertical scales. Each flank station observer records the reading on the horizontal scales. All observers then plunge their telescopes and repeat the tracking procedure.