Which of the following actions should be taken once the vessel is berthed and will not leave port again for several weeks?

Correct Answer: Option C — The GMDSS Radio Operator must log out of the Inmarsat-C system.

Inmarsat-C terminals must be formally logged out of the network when the vessel is in port for an extended period. This action notifies the Network Coordination Station (NCS) that the terminal is inactive, preventing the system from attempting to route messages to a vessel that is not currently operational.