What is the basis for the mill relation method?

The mill relation method is based on the concept that one mil corresponds to an angular measurement that affects the distance to the target. When using the mill relation, it is established that one mil is equal to one meter at a distance of 1000 meters. This foundational principle allows gunners to easily convert angular measurements into linear distances, which is essential for accurate targeting and fire control.

For example, if a target is observed and the angular size is measured in mils, that measurement can be directly converted to actual distance in meters using the relation where one mil equals one meter at 1000 meters. This simplicity in calculation is what makes the mill relation method highly effective and widely utilized in range estimation and artillery calculations.

Other options suggest different relations, which do not align with this fundamental understanding of angular measurement in relation to distance. Therefore, the established equivalence of one mil to one meter at 1000 meters is the correct basis for the method.