ATP-3-09-30 Observed Fires Download

Chapter 5 5-40 ATP 3-09.30 28 September 2017 Example Observer 1 arrives at and occupies a position and locates the survey stake that marks the exact location of the instrument. The tag on the survey stake indicates that the azimuth of the known direction is 1,860 mils and that the direction is identified on the ground as the left edge of a red building approximately 1,500 meters to the right flank, Observer 1 places the aiming circle over the marking stake. With the upper recording motion, the observer sets off an azimuth of 1,860 mils on the azimuth scales. Using the lower motion, the observer aligns the centerlines in the reticle of the instrument on the left edge of the red building. The observer reports to the FDC that he is in position. Observer 1 receives the following message from the FDC: OBSERVE HIGH-BURST REGISTRATION, Observer 1 DIRECTION 0430, VERTICAL ANGLE PLUS 15, and MEASURE THE VERTICAL ANGLE. With the upper motion, Observer 1 turns the azimuth scales to 0430 and sets off +15 on the elevation scales. Observer 1 reports the following to the FDC: OBSERVER 1 READY TO OBSERVE. The FDC sends commands to the weapon to fire the first round. After firing the round, the FDC reports to Observer 1 SHOT, OVER and SPLASH, OVER. When the first round bursts, Observer 1 observes the burst 40 mils left of the reticle vertical centerline and 5 mils below the reticle horizontal centerline. Since the deviation is to the left of the reticle vertical centerline, Observer 1 subtracts 40 from the setting on the azimuth scales (0430) and obtains a direction of 0390. Since the burst appeared 5 mils below the reticle horizontal centerline, Observer 1 subtracts 5 from the setting on the elevation scales (+15) and obtains a vertical angle of +10. Observer 1 reports the instrument readings for the first round: OBSERVER 1 DIRECTION 0390, VERTICAL ANGLE PLUS 10, OVER. Observer 1 reorients the aiming circle on a direction of 0390 and a vertical angle of +10, then prepares to measure the deviation of subsequent rounds. The FDC directs the weapon to fire. After firing the second round, the FDC reports to Observer 1 SHOT, OVER and SPLASH, OVER. 5-113. The procedures for measuring and reporting subsequent rounds are the same as those for the first round, except the observer reads the measurement from the reoriented direction and vertical angle. When the FDC has enough instrument readings to compute the registration data, it terminates the registration by telling observer 1: OBSERVER 1 END OF MISSION. MEAN POINT OF IMPACT REGISTRATION 5-114. In an MPI registration, the FDC selects a ground location as the orienting point and uses impact fuzes in the registration. The establishment of the observation post and the procedures followed by the observers are the same as those in a high-burst registration. Once both observers have spotted the round, the firing data is not changed. After observing each round, each observer reports the direction to the round and the designated observer also reports the vertical angle. This determines a more accurate target location and altitude than is available from just a map spot. 5-115. Observers must be proficient at engaging moving targets of opportunity and in planning and executing planned fires against targets that will be moving at a future time of attack. In either case, the observer must estimate the direction and speed of the adversary, determine intercept and trigger points, and time the firing so that the rounds and vehicle(s) arrive at the desired location at the same time. This section provides an overview of the general procedures for moving targets, both planned and targets of opportunity.