A control system for a work vehicle includes a controller configured to determine a position of a conveyor outlet relative to a storage compartment, and to select a target unloading area from a set of candidate target unloading areas. The set of candidate target unloading areas includes a target circle having a center at an unloading point and a radius corresponding to a threshold range from the unloading point, a bounding shape within the storage compartment, and a selected zone of a set of non-overlapping zones within the bounding shape. In addition, the controller is configured to engage product flow from the conveyor outlet to the storage compartment while the position of the conveyor outlet is within the target unloading area, and to terminate product flow from the conveyor outlet to the storage compartment while the position of the conveyor outlet is outside of the target unloading area.
