On which channel does Digital Select Calling operate?

Digital Select Calling (DSC) operates on Channel 70, which is specifically designated for this function. DSC is part of the Global Maritime Distress and Safety System (GMDSS) and allows vessels to send distress and safety messages automatically via radio. Channel 70 is set aside for Digital Selective Calling (DSC) to ensure that these critical communications can be transmitted and received without interference from voice communications occurring on other channels.

Option 16 is primarily used for distress and calling in the VHF maritime band, while Channel 22 is a working channel used for vessel-to-vessel and vessel-to-shore communications. Channel 21 serves specific operational purposes and is not allocated for DSC. Therefore, Channel 70 is the correct choice as it is uniquely tailored for the use of Digital Select Calling, making it vital for maritime safety and communication efficiency.