ATP-3-09-30 Observed Fires Download
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Adjustment of Fire 28 September 2017 ATP 3-09.30 5-7 Figure 5-4. Height of burst corrections SEQUENCE OF SUBSEQUENT CORRECTIONS 5-24. After the initial round(s) impact(s) the observer transmits subsequent corrections until the mission is complete. These corrections include appropriate changes in elements previously transmitted and the necessary corrections for deviation, range, and HOB. Elements that may require correction and the order in which they are announced are: Observer Target Direction. Danger close and cancel danger close. Trajectory. Method of fire. Distribution. Projectile. Fuze. Volume. Deviation. Range. Height of burst. Target Description. Mission type and method of control. Splash. Repeat. 5-25. Any element for which a change or correction is not desired is omitted. Guidelines for subsequent corrections are discussed below. OBSERVER TARGET DIRECTION 5-26. In the sequence of corrections, the observer target direction is the first item sent to the FDC. The observer must send a grid direction. If the observer is employing a magnetic compass the direction must be converted to grid azimuth before being sent to the FDC. If the observer is using a declinated M2 compass, then the conversion to grid azimuth is already complete. Send the observer-target direction if it has not been sent previously or if the observer-target direction changes by more than 100 mils from the previously announced direction. (Normally, the observer sends direction to the nearest 10 mils but can send it to the nearest one mil depending on the accuracy of the equipment used.)