Explanation: When a DSC radio's dedicated "Distress Hot Key" is activated, it initiates a distress alert. A fundamental safety feature of this alert is the *automatic* transmission of the vessel's current position, along with its Maritime Mobile Service Identity (MMSI), to ensure that search and rescue authorities know precisely where to respond. This critical function requires the DSC radio to be connected to a GPS receiver. Other types of DSC calls, such as routine individual or group calls, do not automatically transmit the vessel's position. While position information *can* be included in some non-distress DSC calls (if manually entered or linked to GPS), it is not an inherent automatic feature for *all* call types. The MMSI is a unique 9-digit identifier for the vessel, not an indicator of its real-time ocean region or specific position. Its initial digits identify the country of registration, not dynamic location data.