How should a GMDSS operator respond if they receive a DSC call requesting a frequency that is not the standard?

A GMDSS operator should verify the information before proceeding when receiving a DSC call that requests a frequency that is not standard. This careful approach ensures that the operator is accurately assessing the situation and the validity of the call. DSC (Digital Selective Calling) calls are critical for maritime communication, and confirming the specifics helps to avoid confusion or miscommunication that could arise from responding on a non-standard frequency.

Standard frequencies are established to facilitate effective communication and coordination during emergencies or routine communications. If a request is made for a frequency that deviates from these norms, it's essential to determine the reason behind the request and if the call is legitimate before taking action. Verifying the information protects both the operator and the vessel and allows for a more structured response if required.

Switching to the default emergency frequency, responding immediately on the requested frequency, or ignoring the call could lead to ineffective communication or failure to respond appropriately to a potentially serious situation. Thus, ensuring the validity of the frequency request is a prudent step for maintaining effective and safe operations.