Which of the following is a DSC watch frequency?

The Digital Selective Calling (DSC) system, part of the Global Maritime Distress and Safety System (GMDSS), has specific frequencies designated for distress and communication purposes. The frequency of 2182.0 kHz is recognized as the primary distress frequency for DSC in the medium frequency (MF) range. This specific frequency is crucial for vessels to monitor for emergency distress calls and is standardized for maritime communication.

Other frequencies listed, while they may be used for different forms of communication or data transmission, do not specifically designate the primary distress frequency used for DSC. For instance, the frequency of 6312.0 kHz is designated for maritime mobile service and is often used for communication, but it is not the primary DSC watch frequency. Similarly, 12577.0 kHz and 16900.0 kHz are employed for different purposes and services within the maritime domain but do not serve as the DSC emergency watch frequency. Thus, 2182.0 kHz is the correct choice, reinforcing its importance in maritime safety and communication protocols.