ATP-3-09-30 Observed Fires Download
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Adjustment of Fire 28 September 2017 ATP 3-09.30 5-5 Request a white phosphorous (WP) round, a smoke round, or a 200 meter airburst with high explosive (HE) on the next round. Repeat. End the mission and start a new mission. Make a bold shift. The observer should be very careful in making bold range or deviation corrections when the target plots near friendly troops. TYPES OF CORRECTIONS 5-12. After making a spotting, the observer must send corrections to the FDC to move the burst onto the adjusting point. The observer sends corrections, in meters, in reverse of the order used in making spottings; that is, deviation, range, and HOB. DEVIATION CORRECTION 5-13. The distance, in meters, the burst is to be moved (right or left) is determined by multiplying the observer's deviation spotting in mils by the observer-target (OT) distance in thousands of meters (the observer- target factor). Express deviation corrections to the nearest 10 meters. A deviation correction of less than 30 meters is a minor deviation correction. The observer should not send minor deviation corrections to the FDC except as refinement data or in conduct of a destruction mission. 5-14. To determine the OT Factor when the observer-target range is greater than 1,000 meters, express the range from the observer to the target (OT distance) to the nearest thousand meters and then the expressed OT distance in thousands. When the range to the target falls half way in between a thousand (for example 1,500 meters or 3,500) meters the observer will round either up or down to the nearest even number. Example Observer-target range = 4,500 meters. Observer-target distance (expressed to nearest thousand) = 4,000. Observer-target factor (expressed in thousands) =4. 5-15. For an observer-target range less than 1,000 meters, express the distance to the nearest 100 meters and expressed in tenths. Example Observer-target range =800 meter. Observer-target factor = .8. 5-16. Announce the computed deviation correction to the FDC as LEFT (or RIGHT) (so much). The correction is opposite the spotting. 5-17. Table 5-1on page 5-6 provides examples of the determination of deviation corrections.