Which of the following is NOT a type of vessel traffic system?

A radar navigation system is primarily a tool used for detecting and tracking vessels, providing situational awareness for navigators. It helps prevent collisions by displaying the position and movement of nearby vessels, but it does not function as a traffic management system.

In contrast, a Vessel Traffic Service (VTS) is a comprehensive traffic management system that provides information and advice to vessels in busy waterways to ensure safe and efficient navigation. The Automatic Identification System (AIS) is another critical component of modern vessel traffic management, enabling vessels to share and receive information such as their location, speed, and course, which aids in collision avoidance. The MarinePilot Guidance System also assists in navigation, particularly in pilotage areas, but it is designed more for guiding vessels through particular points rather than managing traffic on a broader scale.

Therefore, since radar navigation does not serve the functions of managing vessel traffic or providing coordinated information and decision support, it is not classified as a type of vessel traffic system.