While underway, how frequently is the DSC controller required to be tested?

The correct response indicates that the DSC (Digital Selective Calling) controller should be tested once a day while the vessel is underway. This requirement stems from the need to ensure that emergency communication equipment is functioning properly and can be relied upon in critical situations. Regular testing helps verify that the DSC system is operational and that the crew is familiar with its usage, which is especially important during extended voyages and in emergency scenarios where timely communication can be crucial for ensuring safety at sea.

Testing daily encourages good practices and adherence to safety protocols, reinforcing the readiness of the communication equipment. Regular checks can help identify any potential issues before they become serious problems, supporting effective maritime safety and compliance with regulations governing vessel communications.