Which method is considered least preferred for range determination?

The Flash to Bang method is considered the least preferred for range determination, primarily due to its inherent limitations in accuracy and practicality. This method relies on observing a flash from an explosion (such as a weapon firing) and then counting the seconds until the sound reaches the observer. While it can provide a rough estimate of range, the accuracy can be significantly affected by environmental factors such as wind, temperature, and the observer's location relative to the sound's travel path.

In military operations, precision is critical, particularly in direct fire scenarios where the effectiveness of engagements could depend on accurate range calculations. Other methods, such as the adjacent element, MIL relation, and known range, offer more reliable and definitive means of determining range. These methods typically utilize established measurements and calculations or pre-determined reference distances, which enhance certainty in targeting and engagement strategies. Consequently, while the Flash to Bang method may be useful in some contexts, its drawbacks render it the least preferred option for accurately determining range in the context of direct fire engagements.