ATP-3-09-30 Observed Fires Download
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Chapter 5 5-16 ATP 3-09.30 28 September 2017 5-68. When the 50 meter range bracket has been established, two rounds are fired with data 25 meters in the direction opposite that of the last range spotting. If both rounds result in spottings of short (or over), a correction of add (or a drop) of 25 meters with a change in volume to one round is sent. The observer continues firing until obtaining another definite range spotting at the opposite end of the 25 meter range bracket. 5-69. After achieving the requirement of two overs and two shorts with the same data or data fired 25 meters apart has been met, the impact registration is ended with necessary refinement data. Refinement data may include either a deviation correction or a range correction, or both, to the nearest 10 meters. 5-70. In determining refinement data for range, the location of the registration point is determined with respect to the two sets of spottings. Then refinement data are determined and announced. The criteria for determining range refinement data are discussed below. 5-71. If the registration point is nearer the last round(s) fired, no range refinement is necessary to move the impact toward the registration point (see figure 5-7). Figure 5-7. No range refinement necessary 5-72. If the registration point is equidistant between the two sets of rounds, the observer determines the range refinement to be ADD 10 or DROP 10 from the last data fired (see figure 5-8).