What are the mandatory DSC watchkeeping bands/channels?

The correct answer identifies the mandatory Digital Selective Calling (DSC) watchkeeping bands and channels as 8 MHz HF DSC, one other HF DSC, 2 MHz MF DSC, and VHF Channel 70.

Understanding the specific frequencies and channels for DSC is crucial for effective maritime communication, particularly in distress situations. The frequencies mentioned serve designated roles:

• 8 MHz HF DSC is allocated for DSC communications and is part of the High Frequency (HF) band, which allows long-distance communication.

• An additional other HF DSC frequency provides redundancy and additional channels for communication, which is essential for safety at sea.

• 2 MHz MF DSC operates in the Medium Frequency (MF) band, which is important for communication within coastal ranges and is especially useful for vessels operating in proximity to land.

• VHF Channel 70 is specifically established for DSC distress and safety communications in the Very High Frequency (VHF) band, allowing for immediate response to distress alerts on a common channel.

In combination, these channels and frequencies ensure that a vessel can monitor distress calls from other vessels and respond effectively, fulfilling international requirements for maritime safety and communication protocols.