What is the significance of range cards in indirect fire planning?

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Range cards condense firing data into a single quick-reference tool that supports accurate indirect fire. They provide the gun crew with the essential information for a target location—ranges to the target, azimuths, and data points necessary to lay the weapon and adjust fire precisely. This shared reference helps the observer and the firing unit stay synchronized, allowing rapid, correct targeting decisions under stress and reducing the chance of errors during transmission of firing data. In planning, a range card maps the target, observer, and gun positions, capturing the initial ballistic data and any precomputed corrections so rounds can be placed on target quickly. It’s not about logging supply, weather, or training-only use; those aspects are separate, while the range card specifically supports accurate, efficient targeting in the engagement.