The work deals with the organization of the supply of ship's supplies by a maritime agent at the captain's request. The efficiency of the ship's operation directly depends on how fully the ship is provided with fuel, water, food and items necessary for the life of the ship and the crew. A maritime agent must be present in all supply operations. All vessels receive supplies at the port of call or port of call during the voyage. In this case, the ship's agents in these ports assume the function of organizing the supply and bunkering of the ship. To organize the uninterrupted supply of ships, we will consider the application of the theory of stock management.