ATP-3-09-30 Observed Fires Download
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Chapter 5 5-20 ATP 3-09.30 28 September 2017 Example Impact Registration (see figure 5-10 on page 5-18) Round Spotting 4 +6R 5 -8R 6 -5R 7 +7R Sum of deviations is 6R + 8R + 5R + 7R = 26R. Average deviation is 26R ÷ 4 rounds = 6.5R ≈ 6R. Observer-target factor is 3. Mean point of impact is 3 X 6R = 18 meters R ≈ 20 meters R. Correction is LEFT 20, DROP 10, RECORD AS REGISTRATION POINT, END OF MISSION, OVER. Example Impact Registration Round Spotting 1 Target 2 +7R 3 -3L Sum of deviations is 0 + 7R + 3L = 4R. Average deviation is 4R ÷ 3 rounds = 1.33R ≈ 1R. Observer-target factor is 2. Mean point of impact is 2 X 1R = 2 meters R ≈ 0 (no deviation correction). Correction is ADD 10, RECORD AS REGISTRATION POINT, END OF MISSION, OVER. MORTAR REGISTRATION 5-78. Mortar registration procedures are identical to the impact registration procedures for artillery. The exception is that once a 100 meter range bracket has been split and the last round fired is within 50 meters of the target, the observer sends refinement corrections to the FDC and ends the mission. Make range corrections to the nearest 25 meters. Only one round over and one round short are required. Figure 5-11 (on page 5-20) shows an example of the last two transmissions to the FDC.