ATP-3-09-02 Field Artillery Survey Download
Page 76 of 168
Chapter 5 5-18 ATP 3-09.02 16 February 2016 5-38. The final step is to mean the horizontal readings and achieve a mean horizontal angle. Mean the direct and reverse reading to the Rear Station. Make the reverse reading look like the forward reading by adding or subtracting 3200. Add the 2 results together and then divide by 2. The resulting mean reading is recorded in the mean column R row. Mean the direct and reverse readings to the 1 st forward station. Make the reverse reading look like the forward reading by adding or subtracting 3200. Add the two results together and divide by 2. The resulting mean reading is recorded in the mean column R row Mean the direct and reverse readings to the 2 nd forward station. Make the reverse reading look like the forward reading by adding or subtracting 3200. Add the two results together and divide by 2. The resulting mean reading is recorded in the mean column R row Subtract the mean reading to the rear station from the mean reading of the 1 st Forward station record the Mean Horizontal Angle in the Horizontal Angle Column in the mean angle row. Subtract the mean reading to the Rear Station from the mean reading to the 2 nd Forward station record the Mean Horizontal Angle in the Horizontal Angle Column in the mean angle row (see figure 5-29). Figure 5-29. Mean horizontal angles