What action should be taken before powering down an Inmarsat-C terminal?

Logging out with the current NCS (Network Control Station) before powering down an Inmarsat-C terminal is essential for several reasons. First and foremost, this action informs the NCS that the vessel is going off the air, which allows for proper management of the network resources and ensures that the NCS can allocate bandwidth effectively to other users.

Additionally, logging out ensures that any pending messages or session data are properly handled and not left hanging or lost, which could occur if the terminal is powered down suddenly without notifying the NCS. This behavior maintains the integrity of communications and helps prevent interruptions in service for both the vessel and the network.

Taking this proactive measure is in accordance with best practices for maritime communication systems and reflects responsible operation protocols for ensuring that maritime communication systems function smoothly and efficiently.