Vessel traffic services (VTS) is a marine information exchange system vital for the safety and efficiency of ship traffic within designated regions. The harmonisation, integration and exchange of marine information have emerged as significant components in promoting maritime safety, in line with the concept of e-navigation. This study aimed to analyse the flow of information between VTS areas employing social network analysis to ensure seamless marine information exchange across VTS areas. Information flow was analysed based on data obtained from ships navigating through coastal waters and ports in Korea, revealing that the sea area near Busan New Port exhibited the highest concentration of information flow, while the Tongyoung Coast VTS area represented a critical link in the flow of information. Given its history of marine accidents, the current Masan (Opko) VTS region emerged as a susceptible area. The study provides valuable foundational data for a comprehensive coastal surveillance system.