Which channel is used for general traffic communications in GMDSS?

In the context of GMDSS (Global Maritime Distress and Safety System), the channel used for general traffic communications is Ch-6 Radiotelephony. This channel is designated specifically for maritime mobile communication and is primarily utilized for non-distress communications between ship stations and shore stations or other ships.

Ch-6 operates on a fixed frequency of 156.300 MHz, and it allows for voice communication, which is essential for coordinating navigational information, vessel traffic, and other routine communications that are crucial for the safety of maritime operations. Its importance lies in its accessibility for general communication purposes, facilitating the exchange of information between vessels without overriding emergency communications.

The other channels mentioned have specific functions as well. Ch-70 DSC is allocated for Digital Selective Calling, a method used primarily for distress and calling purposes rather than general communications. Ch-16 DSC serves a similar role as a distress and calling frequency specifically for radiotelephony and DSC alerts, making it unsuitable for ordinary traffic. Lastly, Ch-13 is primarily reserved for bridge-to-bridge communications regarding navigational safety, which does not broadly cover general traffic communication needs.

Thus, Ch-6 is clearly identified as the correct choice for general traffic communications within the GMDSS framework.