Regardless of the age or sophistication of the fire control systems at your location, what is the primary function of these systems?

  The primary function is to perform the same task than a human gunner but faster and more accurately.

Explanation:

  Fire control systems consist of a number of components working together, usually a gun data computer, a director, and a radar. These components assist the weapon system in targetting, tracking and hitting its target.

  I hope this answer helps you.