What VHF Channel is used for Digital Selective Calling and acknowledgement?

Channel 70 is the designated VHF channel for Digital Selective Calling (DSC) and acknowledgment functions. DSC is an automated system used in maritime communication to send distress alerts, safety messages, and routine communication between ships and shore stations. This system operates on Channel 70, allowing vessels to send and receive digital alerts without requiring voice communication.

Channel 70 operates at a specific frequency of 156.525 MHz and is exclusively allocated for DSC transmissions, which helps separate these digital messages from regular voice communications on other VHF channels. This specialized function allows for efficient and effective distress signaling and safety communication, which is crucial in emergency situations at sea.

Other channels listed, such as Channel 16 and Channel 22, are primarily used for routine voice communication and emergency distress calls but do not facilitate the digital selective calling system specifically. Channel 25, while part of the VHF spectrum, is also not designated for DSC. Understanding the unique functions of each channel is important for effective maritime operations and safety.