What is the HOB correction when one airburst and three graze bursts are observed during precision registration?

In the context of precision registration, the Horizontal Oblique Burst (HOB) correction is determined based on the observations of airburst and graze bursts during live fire. An airburst occurs when the munitions explode above the target, while graze bursts occur when the munitions strike the ground very close to the target.

When one airburst and three graze bursts are observed, these findings indicate that the rounds are not impacting in the desired area. Specifically, the presence of one airburst suggests that the rounds may be impacting too high, while the three graze bursts indicate they are also hitting the ground but not at a distance that effectively covers the target area.

In this situation, to adjust the fire for a more effective impact, a correction is needed in the downwards direction. The observed data typically requires a "up" correction, indicating that the rounds need to be fired at a higher elevation angle to achieve the desired impact on target.

The established standard for such corrections during precision registration is as follows: the airburst usually contributes to the correction by a value (in this case, reflecting a need for a greater adjustment) that when combined with the effects of graze bursts leads to a total correction of "up