During SITOR (NBDP) ARQ operations, what should the GMDSS operator do during the automatic exchange of answerbacks?

During SITOR (NBDP) ARQ operations, it is essential for GMDSS operators to understand the dynamics of automatic exchanges, particularly how answerbacks work. When an automatic exchange of answerbacks occurs, the operator should indeed do nothing and simply wait for the GA+? prompt. This is because the system is designed to handle these exchanges automatically.

By remaining inactive, the operator allows the system to complete the transmission process as intended without introducing unnecessary interference or confusion. This method ensures that the communications remain clear and efficient. The GA prompt will indicate that the operator can proceed or respond as required once the automatic process has been completed, maintaining proper protocol and minimizing the risk of errors during data exchanges.

Other options imply taking actions that could interrupt the automatic transmission, which may lead to misunderstandings or potential communication failures. Therefore, the recommended approach emphasizes a wait-and-respond methodology when engaged in automatic SITOR operations.