What role do charts play in mortar calculations?

Charts play a crucial role in mortar calculations primarily by providing firing data for different ranges and angles. These charts are specifically designed to assist the operator in adjusting the mortar's elevation and deflection settings to accurately hit a target at various distances and elevation angles. This precision is essential for the effectiveness of mortar fire in combat situations, ensuring that munitions land where they are needed most.

The use of charts allows for quick reference to firing solutions under varying conditions and criteria, which can significantly enhance the accuracy of mortar operations. By consulting these charts, personnel can determine the appropriate settings based on the parameters of the engagement, including the type of ammunition used and the desired impact point.

The other options, while related to artillery and military operations, do not accurately reflect the primary function of charts in mortar calculations. For instance, charts are not used for ammunition storage planning, transport estimates, or directly indicating weather conditions, which are separate considerations that may affect overall operations but are not their main focus in the context of firing solutions.