If the registration point is equidistant between two sets of rounds, what does the observer determine the range refinement to be?

When the registration point is equidistant between two sets of rounds, it indicates that the rounds have impacted equally before and after the registration point. This situation allows the observer to determine that the range refinement will involve a calculated adjustment based on the mid-point of the impacts.

The most accurate practice in range refinement under these circumstances—where the goal is to zero in on the observed target—is typically to make a conservative adjustment of 10. This adjustment is designed to correct any minor discrepancies while ensuring effectiveness without overshooting or undershooting the target.

Therefore, when the observer sees that the rounds are evenly spaced around the registration point, they will conclude that the most appropriate range refinement is to add or drop 10. This aligns with the established procedure to adjust fire effectively based on observed impacts.