What is the deviation refinement that an observer should send to the FDC with the given OT Factor and spottings of +7R, +15R, -5L, and +3R?

To determine the correct deviation refinement that an observer should send to the Fire Direction Center (FDC), it's important to analyze the provided spottings systematically. The spottings indicate the observed impact of rounds in relation to the target, where "R" stands for right and "L" stands for left.

The spottings given are:

• +7R

• +15R

• -5L

• +3R

These values represent the deviation from the observer's original aim point. The positive values indicate hits to the right, while negative values indicate hits to the left.

To refine the deviation, we need to calculate the average deviation. By converting all spottings to a single side (in this case, right), we can sum the values as follows:

1. Convert the left spotting to its right equivalent, so -5L becomes +5R for the purposes of summation.

2. Next, combine all the right deviations:

• +7R + +15R + +5R + +3R = +30R

This total indicates that the overall deviation is 30R. However, we also need to consider marking the adjustments based on the original OT Factor. Since the observer is looking