Are vessels required to monitor Channel 16 if they have GMDSS equipment?

The correct answer is that vessels with GMDSS (Global Maritime Distress and Safety System) equipment are required to monitor Channel 70 for Digital Selective Calling (DSC) and the frequency of MF 2187.5 kHz. Channel 16, while often used for voice communications and distress calls, is an open VHF channel primarily designated for safety communications.

However, with the advent of GMDSS, which automates distress and safety communications, the requirement to monitor Channel 16 is not mandatory if vessels are equipped with GMDSS gear. Instead, those vessels are obligated to monitor Channel 70, which is specifically designed for DSC alerts, allowing them to receive distress signals and other critical safety communications effectively. The frequency of MF 2187.5 kHz is also vital for similar reasons, enhancing the vessel's capability to respond to emergencies.

This distinction underscores the evolution in communication protocols in maritime operations, focusing on more efficient and automated systems, which is a hallmark of GMDSS. Monitoring Channel 16 can be a practice of convenience or additional safety but is not a requirement under the GMDSS framework.