A system that determines the error existing between the aircraft gunsight and the gun systems, while prescribed aircraft maneuvres are performed, and automatically corrects the gunsight system to compensate for this error. The system includes a bullet sensor, such as a television camera, hardware that determines the bullet positions relative to the gun boresight, computational means to determine the above mentioned error, and means to store the error and correct the gunsight system according to this error. This system yields a lower cost, more accurate, and more convenient method requiring less skilled labor than that presently used to accomplish the same result.