Which of the watches is specifically tasked with overseeing entry and exit at the gangway?

The role that is specifically tasked with overseeing entry and exit at the gangway is Access Control. This function is primarily focused on managing who is allowed to enter or exit the secured area, ensuring that only authorized personnel have access. Access Control personnel are responsible for verifying identities, conducting security checks, and monitoring the flow of individuals to maintain safety and security standards.

The other options serve different functions; for instance, ECP Cover usually refers to guarding the Entry Control Point as a whole, but not necessarily overseeing every individual entry or exit. A Bag Checker typically focuses on inspecting bags and personal belongings for security purposes, which is part of the overall security protocol but not specifically about managing entry and exit itself. Topside rovers are involved in patrolling certain areas to enhance security but do not usually have the designated responsibility for managing the gangway traffic specifically. Hence, the Access Control function is uniquely appropriate for the task at hand.