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In the context of the Global Maritime Distress and Safety System (GMDSS), there is one primary Medium Frequency (MF) frequency designated for Digital Selective Calling (DSC) distress-related calls. This frequency is 2187.5 kHz, which is the internationally recognized frequency specifically allocated for distress, safety, and calling.

The choice of having a single frequency for distress-related calls helps to minimize confusion and ensures that vessels in distress can effectively communicate their situation. Since this frequency is monitored by shore stations and other vessels, it is crucial for facilitating prompt rescue efforts. The emphasis on a single designated frequency enhances the reliability of distress communications, making it easier for authorities to coordinate responses effectively.

Other frequencies in the MF band serve different purposes, including operational communications, but for distress-related DSC communications, 2187.5 kHz is the sole designated frequency recognized internationally.