ATP-3-09-02 Field Artillery Survey Download
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Chapter 5 5-12 ATP 3-09.02 16 February 2016 5-24. If the right stadia line is off the scale, (see figure 5-17) read the scale where the center vertical cross hair crosses the scale. The reading is then doubled and the total is the distance in meters. In this example 6.4 plus 6.4 is 12.8 meters. Record the distance in the recorder’s notebook in the Distance column. Figure 5-17. Scaling distance stadia line off scale HORIZONTAL ANGLE MEASUREMENTS 5-25. Prior to beginning to turn horizontal angles, an initial circle setting of 0001.0 must be set on the Horizontal Scale on the display (see figure 5-18). To accomplish this, rotate the instrument slowly in a clockwise direction until the Horizontal Reading HA is close to 0001.0 mils. Use the horizontal clamp to lock the instrument in place. Use the Horizontal Tangent screw to set the Horizontal Reading to 0001.0 mils. Once this is accomplished press the hold button to lock the setting in place. Figure 5-18. Initial circle setting