authors
Abd. Rakhman, Tetra Hidayati and Musdalifah Azis

abstract
Method of assignment on the tugboats Samara & MR 702 shows that the movement of tugboat services can minimize tugboat service costs. The population and sample are the same, using the saturated sampling technique. The data used is the number of tugboat service movements, totaling 900 over an observation period of 30 months, starting from March 2021 to October 2024. It can be seen that the greater the tugboat service movement, the tendency is to lower the service costs. In the 30-month observation period, the tugboat service movement in this study showed that 9 minimal service activities and 23 maximal monthly service activities have been achieved, and this is the optimal solution for the services in months 1-10. For services in months 11-20, it showed 26 minimal service activities and 36 maximal tugboat service activities have been achieved. Furthermore, for services in months 21-30, 33 minimal service activities and 43 maximal tugboat service activities have been achieved. This analysis confirms that the higher the frequency of tugboat service movements, the lower the service costs, showing a trend that higher service movement frequency directly correlates with cost efficiency. This is reflected by the achievement of minimal and maximal service activities in each observation period. The three observation periods provide a strong basis for operational decision-making and future planning. The results of this study are to adjust service strategies, allocate resources more efficiently, and optimize the rotation of tugboat services to reduce overall costs while maintaining service standards.