ATP-3-09-02 Field Artillery Survey Download
Page 68 of 168
Chapter 5 5-10 ATP 3-09.02 16 February 2016 Figure 5-13. Telescope reverse mode 5-21. After achieving autoreflection, read the Reverse Vertical Angle which is annotated by VA on the display (see figure 5-14). Record the Reverse Vertical Reading in the Recorder’s Notebook in the Vertical Reading Column which it the R row which stands for Reverse Mode. Figure 5-14. Reverse vertical angle recording 5-22. The next step is to mean the vertical angle reading (see figure 5-15 on page 5-11). To figure out the Direct Vertical Angle use the Direct Vertical Reading. If the reading is greater than 1600, subtract 1600 from the vertical reading and record in the Vertical Angle column in the D row. The vertical angle will be in the 2 nd Quadrant, therefore, the vertical angle is negative. If the reading is less than 1600, subtract the reading from 1600. The vertical angle will be in the 1 st Quadrant therefore the vertical angle is positive. To figure out the Reverse Vertical Angle, use the Reverse Vertical Reading. If the reading is greater than 4800, subtract 4800 from the Vertical Reading.and enter the value in the Vertical Angle column in the R row. The vertical angle will be in the 4 th Quadrant, therefore, the Vertical Angle is positive. If the reading is less than 4800, subtract the reading from 4800.The Vertical Angle will be in the 3 rd Quadrant, therefore, the Vertical Angle is negative. Take the 2 values in the Vertical Angle column, add them together, then divide by 2. This value is the mean Vertical Angle. Record the value in the Vertical Angle column, in the Mean Angle row. Ensure you use the positive or negative symbol.