Recently, Vessel traffic service (VTS) operators are highly required to get the ability to manage traffic flow, by detecting Conditions that Requires Attention (CRA) from the monitoring screen. The authors elucidated the cognitive processes of VTS operators for detecting CRA, after that they are planning to propose training methods for the inexperienced operators. As the first step of the study, in order to acquire the cognitive contents of VTS operators, we observed the difference of management process between inexperienced and experienced operators by the experimental analysis based on an on-site viewpoint. A series of traffic management process experiments by using a simulator for training VTS operators was carried out for both inexperienced and experienced operators. In order to understand the management process of operators, we proposed a management task chart based on the results of the experiments. The result shows that the inexperienced operator handles a few CRA intensively, while the experienced operators handle many CRA at the same time. It also shows that in order to make more rational the management task, it is necessary to properly select the concerned ship of CRA, the contents and the timing for calling the ship.
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