Which of the following is a GMDSS telecommunications subsystem?

Which of the following is a GMDSS telecommunications subsystem?

• A. DSC
• B. SART
• C. VHF
• D. MF

Answer: (A)

Digital Selective Calling is the digital signaling function at the heart of GMDSS. It automates distress, urgency, and routine calls by sending digital messages that identify the vessel (via MMSI) and establish contact across the GMDSS networks (VHF, MF/HF, satellite). This digital calling capability is what defines the telecommunications subsystem in GMDSS. SART is a location beacon used to aid rescuers, not a signaling subsystem; VHF and MF are radio channels used for voice or data but do not by themselves constitute the digital signaling subsystem.

Digital Selective Calling is the digital signaling function at the heart of GMDSS. It automates distress, urgency, and routine calls by sending digital messages that identify the vessel (via MMSI) and establish contact across the GMDSS networks (VHF, MF/HF, satellite). This digital calling capability is what defines the telecommunications subsystem in GMDSS. SART is a location beacon used to aid rescuers, not a signaling subsystem; VHF and MF are radio channels used for voice or data but do not by themselves constitute the digital signaling subsystem.