Which of the following is a satellite system mentioned in the GMDSS subsystems?

Which of the following is a satellite system mentioned in the GMDSS subsystems?

• A. INMARSAT B
• B. NAVTEX
• C. SITOR
• D. DSC

Answer: (A)

Global Maritime Distress and Safety System uses multiple paths to ensure messages get through, including satellite links for global coverage. One satellite-based network historically mentioned in GMDSS subsystems is provided by Inmarsat, with services like Inmarsat B that support two-way satellite communication for distress alerts, voice, and data. This makes it the satellite component among the options. NAVTEX is a coastal broadcast system using MF frequencies and is not satellite-based. SITOR is a land-based digital telex-like mode used on MF/HF radio. DSC is a digital calling method used on VHF/MF/HF frequencies via terrestrial channels.

Global Maritime Distress and Safety System uses multiple paths to ensure messages get through, including satellite links for global coverage. One satellite-based network historically mentioned in GMDSS subsystems is provided by Inmarsat, with services like Inmarsat B that support two-way satellite communication for distress alerts, voice, and data. This makes it the satellite component among the options. NAVTEX is a coastal broadcast system using MF frequencies and is not satellite-based. SITOR is a land-based digital telex-like mode used on MF/HF radio. DSC is a digital calling method used on VHF/MF/HF frequencies via terrestrial channels.