What is the minimum deviation or range correction made while adjusting illumination?

The minimum deviation or range correction made while adjusting illumination is established as 200 meters. This value is based on the need for a significant change to ensure that the illumination rounds achieve the desired effect in the target area. Illumination adjustments often require a greater correction than other types of munitions since the purpose is to light up an area for visibility rather than hitting a specific target.

This substantial adjustment helps to account for variables such as the trajectory of the rounds, wind conditions, and other atmospheric influences that could affect the dispersion of the illumination. A correction of 200 meters ensures that the illumination is effective and adequately lights the intended area, allowing for better observation and engagement capabilities.

The other choices represent smaller corrections that would not be sufficient for the purpose of adjusting illumination rounds effectively, thus affirming why the minimum deviation is set at 200 meters for optimal results in fire support operations.