When should the observer announce the difference in the vertical shift?

The appropriate moment for the observer to announce a difference in the vertical shift is when it exceeds a measurement of 35 meters. This threshold ensures that the information communicated is significant enough to warrant attention and potential corrective action. Vertical shifts, which can occur due to factors like changes in terrain elevation or scope settings, can impact the accuracy of fire support missions. By setting the limit at 35 meters, the observer is prioritizing communication that is critical to effective targeting and minimizing the risk of overshooting or undershooting the intended target.

In contrast, announcing differences that are either less than or equal to this benchmark may not signify a substantial deviation, and thus may not require immediate attention or adjustment, leading to either unnecessary confusion or lack of clarity in communication. This guideline helps to streamline operations and maintain focus on only the most pertinent shifts.