Which of the following statements about GMDSS is true?

• A. It links shore-based rescue authorities with ships in distress
• B. It is a satellite-only system
• C. It operates only when a ship is in port
• D. It replaces all on-board radios

Answer: (C)

Global Maritime Distress and Safety System (GMDSS) is a worldwide network that ensures rapid distress signaling and safety communications between ships and shore-based rescue authorities. The true statement is that it links shore-based rescue authorities with ships in distress, so alerts and safety information can be directed to the right Rescue Coordination Center or coast station and prompt a coordinated response. It isn’t satellite-only; GMDSS uses a combination of satellite and terrestrial means, including VHF, MF/HF, and shore stations, to reach ships anywhere at sea. It does not operate only when a ship is in port, but is designed to function globally at sea for emergencies. It also doesn’t replace all on-board radios; ships still have their own radio gear, and GMDSS provides additional, automated mechanisms for distress and safety communications.