Abstract: A docking system useful to connect and place in communication a first operating unit (3) including one or more fluid accumulators and at least one second mobile service unit (7) carrying fluid in a reservoir for refilling the accumulators. The operating unit and the at least one second mobile service unit each include hydraulic connectors carried by a floating support connected to a float supporting device to facilitate alignment and connection of the hydraulic connectors. In one example, the docking system includes a stationary intermediate structure (5) to indirectly connect and communicate the hydraulic connectors of the operating unit and the second mobile service unit. In one example, the at least one second mobile service unit is an automated guided vehicle or an autonomous mobile robot.