What sequence of ARQ codes is used for manual over, end of message text, and end of connection to land destination terminal?

The sequence of ARQ codes used for manual operation, the end of message text, and the end of connection to the land destination terminal is represented by the chosen answer. The first code, "+?", is a request indicating that the operator needs to clarify or confirm something; this is often used in manual transmission situations where operator interaction is necessary. The second code, "NNNN," serves as a standard way to indicate the end of a message text, signaling that the content has been fully delivered. Finally, "KKKK" indicates the end of the connection to the land terminal, effectively terminating the communication session.

This understanding is crucial for operators in maritime communication, particularly in utilizing the GMDSS (Global Maritime Distress and Safety System) effectively for safety and operational efficiency at sea. Each part of the ARQ code sequence is specifically tailored to facilitate clear communication in maritime operations, ensuring that messages are understood and that connections can be gracefully concluded.