When should you make your next call after departing from P-18 berth 4 and after your initial call to VTS?

Making the next call after departing from P-18 berth 4 is critical for maintaining effective communication with Vessel Traffic Services (VTS) and ensuring navigational safety. The correct choice emphasizes the importance of notifying VTS as soon as the vessel is off the dock. This call serves to confirm the vessel's departure and provides real-time information to VTS, enabling them to monitor the vessel's movements and manage traffic in the surrounding waters.

This timing helps ensure that VTS has the most current information for situational awareness, which is vital for safe navigation, particularly in busy or congested areas. By calling as soon as the vessel is clear of the dock, the crew establishes their operational status and assists in the efficient management of traffic, potentially preventing conflicts with other vessels.

While other suggestions may also offer reasons for making calls at various points in the journey, they do not capture the immediacy and importance of communicating directly after departure.