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Digital Selective Calling (DSC) allows sailors to initiate direct radio communication with another vessel without using the hailing channel 16.0:21 The system operates by sending a data packet over channel 70, which triggers an audible alert on the receiving radio once it recognizes the target vessel's unique nine-digit Maritime Mobile Service Identity (MMSI) code.1:19 To place an individual call, the operator selects the "Individual Call" function on the VHF radio, inputs the target vessel's MMSI, and designates a working channel, such as 72 or 77, for the subsequent voice conversation.5:55 The initiating radio remains in a "waiting for acknowledge" state until the receiving station accepts the call.4:25 Upon acceptance, both radios automatically tune to the pre-selected working channel, bypassing the standard protocol of hailing on channel 16 and manually switching frequencies.4:45 This method ensures reliable contact even if the receiving radio is currently tuned to a channel other than 16.0:21

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