On which channel are DSC (Digital Selective Calling) calls made?

DSC (Digital Selective Calling) calls are made on Channel 70, which is specifically designated for this purpose. This channel operates on a frequency of 156.525 MHz and is used exclusively for the transmission of DSC signals, which includes the sending of alerts and position reports, as well as distress calls.

Channel 70 is essential for establishing digital communication and does not carry voice transmission, allowing for a clear signaling method without interference. This separation ensures that emergency calls can be quickly and efficiently communicated to nearby vessels and shore stations.

Other channels mentioned, such as Channel 16, primarily serve as a hailing and distress channel for voice communication and are not used for DSC transmissions. Channel 22A is typically utilized for non-distress maritime communications, and Channel 12 is used for specific operational communications. Therefore, the unique role and frequency of Channel 70 make it the correct answer for where DSC calls are made.