Army OCS Call For Fire Practice Test

In Polar Call For Fire, what must the FDC know prior to the Call for Fire?

Observer's Location Target Elevation Wind Speed Target Movement

Correct Answer:

Observer's Location

Explanation:

Knowing the observer’s location is essential because polar calls rely on the observer as the reference point. In Polar Call For Fire, the observer reports the target using range and bearing from themselves. The FDC must know exactly where the observer is to convert that relative information into an absolute firing solution on the map, determine the target’s grid location, and compute the initial firing data. Without the observer’s position, the FDC cannot translate the polar coordinates into where to fire. Wind speed, target elevation, and target movement matter for refinements and corrections after the initial call, but they don’t establish the firing solution by themselves. The critical prerequisite to begin the Call For Fire is knowing the observer’s location.

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