ATP-3-09-30 Observed Fires Download
Page 92 of 204
Chapter 5 5-8 ATP 3-09.30 28 September 2017 Example An observer began an adjustment on several enemy vehicles and used a tree at direction 5620 as the adjusting point. During the adjustment, the enemy vehicles moved to a new position an appreciable distance from the initial adjusting point. The observer selects a new adjusting point and measures a direction of 5840 to the new point. Since the difference between the directions to the old and new adjusting points exceeds 100 mils, the first element in the observer’s next correction is DIRECTION 5840. DANGER CLOSE AND CANCEL DANGER CLOSE 5-27. If the adjustment of fires brings impacting rounds within danger close distance during the conduct of the mission, the observer must announce DANGER CLOSE to the FDC. The observer makes corrections from the round impacting closest to friendly troops using the creeping fire technique discussed in Section II, Creeping Fire (Danger Close). If the adjustment of fires moves the round outside the danger close distance, the observer transmits CANCEL DANGER CLOSE. TRAJECTORY 5-28. The observer requests a change in the type of trajectory if it becomes apparent that high angle fire is necessary during a low angle adjustment or that high angle fire is no longer necessary during a high angle adjustment. For example, if during the conduct of the mission a target moves into a defilade position, the observer may change trajectory by transmitting the correction HIGH ANGLE. Conversely, if a target moves out of defilade into open terrain and high angle fire is no longer necessary, the observer requests CANCEL HIGH ANGLE. METHOD OF FIRE 5-29. The observer transmits any correction that is necessary in the method of fire. For example, if the observer wants to change from one gun to a platoon firing in order from left to right, the correction sent is PLATOON LEFT. If wanting to change a platoon firing in order from right to left, the correction sent is PLATOON RIGHT. DISTRIBUTION 5-30. If an observer wants to change the distribution of fire from an artillery computer system sheaf (circular with a 100 meter radius) to another type of sheaf, the observer requests the sheaf desired (CONVERGED, OPEN, or LINEAR or the target length, width, and attitude). Conversely, if the observer wants to change from a specific sheaf to an artillery computer system sheaf, the transmission sent is CANCEL, followed by the type of sheaf being used (for example, CANCEL CONVERGED [or OPEN] SHEAF). PROJECTILE 5-31. If the observer wants to change the type of projectile, the observer announces the desired change (for example, SMOKE or WP). FUZE 5-32. If the observer wants to change the type of fuze or fuze action, the observer announces the desired change (for example, TIME, DELAY, or VT [variable time]). VOLUME 5-33. If the observer want to change the volume of fire, the observer announces the desired change (for example 2 ROUNDS or 3 ROUNDS). Volume refers to the number of rounds in the fire for effect phase.