The static, dynamic, and navigation-related information of the vessel collected from the Automatic Ship Identification System (AIS) for VTS control has become an essential element in coastal and port control service. However, there are errors in the AIS data collected in VTS due to technical and institutional inadequacies, but research on the error status analysis of the generated data is insufficient. Therefore, this Study analyzes which AIS data mainly causes errors and how much environmental influence the errors occur through a survey of VTS Operators who receive AIS data in a stable environment and continuously use them for work. As a result, it was found that although there are some differences in environmental impact, errors mainly occur in data not input by the user, such as the ship's heading and position. In order to reduce this specific AIS data error, it is expected that some problems can be solved if the verification process for AIS data on the ship is introduced and the policy supplement for the AIS operation of the ship's navigator and VTS Operator is paralleled.