Limited cooperation and communication among the departments in the ship was the main problem in this research, especially Dynamic Position Operator and technical personnel like chief engineer and electronic technician, due to unmastered experience and knowledge. This research was to know the direct and indirect influences of training, certification mediated by the work effectiveness of dynamic position operator on the optimization of Supply Vessel’s backload in the offshore operation in Aramco Region of Saudi Arabia. This research used the approach of Partial Least Square based Structural Equation Model with research sample as many as 100 Dynamic Position Operators as respondents. The result of this research showed that training, certification and mediated by the work effectiveness of Dynamic Position Operator directly and indirectly influence the optimization of cargo backload significantly. The work effectiveness of dynamic position operator was able to mediate the influence of training and certification of the dynamic position operator on the optimization of supply vessel’s cargo backload in the Region of Aramco Saudi. The work effectiveness of Dynamic Position Operator directly and significantly influenced the optimization of cargo backload.