The observer announces the difference in the vertical shift if it is greater than how many meters?

• A. 25
• B. 50
• C. 75
• D. 35

Answer: (D)

In this context, the observer reports a vertical correction only when the difference between where the round landed and the target requires a meaningful adjustment to elevation. That threshold is 35 meters. Why this makes sense is that small vertical differences—say under 35 meters—can be caused by measurement noise, wind, or minor inaccuracies that don’t justify a full correction. Waiting for larger errors avoids over-correcting and keeps adjustment communications efficient. If the vertical error exceeds 35 meters, it’s significant enough to warrant telling the firers to change elevation to bring subsequent rounds onto target. The other numbers would either flag too many minor fluctuations (25 meters) or delay and overstate the needed correction (50 or 75 meters), making 35 meters the practical, standard cutoff.