Which type of fire mission requires a "shift from a known point"?

The type of fire mission that requires a "shift from a known point" is specifically designed for scenarios where the target's location is determined based on a reference point that is already established. This approach allows for adjustments to be made in relation to that known point, facilitating accurate targeting when the exact location of the target may not be precisely mapped out but can be located in relation to the known reference.

In contrast to the other options, which have distinct methodologies for targeting and adjustments, this method utilizes the known reference point to efficiently reorient fire towards changing or dynamically located targets. Knowing where the adjustments need to occur relative to a stable point improves the accuracy and effectiveness of the fire mission, especially in fluid combat situations where targets may change swiftly.