Which special instruction is primarily focused on adjusting the aim?

The instruction that focuses primarily on adjusting the aim is special corrections. This instruction involves making specific adjustments to the aiming point based on various factors such as wind, range, and the target's position. Special corrections are vital in ensuring that the projectile lands as intended on the target, accounting for environmental conditions and other variables that can affect accuracy.

This adjustment process is essential in artillery operations to ensure precision in firing. By utilizing special corrections, operators can effectively adapt to dynamic battlefield conditions, increasing the likelihood of successful target engagement.