Subelement E: Survival Craft Equip & S.A.R.— Topic :
Question 36E3
Element 7R (GMDSS-RO)Which GMDSS equipment is best suited to simultaneous long-range communications with an RCC/coast station and OSC vessels or SAR aircraft?
Explanation
MF-HF SSB transmitters are ideal for simultaneous long-range GMDSS communications because MF-HF frequencies support reliable long-range propagation via groundwave and skywave, crucial for reaching distant RCCs, coast stations, and SAR assets in Sea Areas A2, A3, and A4. Single Sideband (SSB) provides voice communication, enabling real-time, dynamic coordination and information exchange among multiple parties (distress vessel, SAR aircraft, OSC vessels, RCC). This direct, simultaneous voice interaction is critical during a fast-evolving SAR operation.
MF-HF SITOR (NBDP) (A) is text-based, not conducive to simultaneous voice coordination among multiple parties. Inmarsat (B) relies on routing through an RCC, creating delays and lacking direct, simultaneous multi-party communication among all participants. VHF (C) is limited to line-of-sight and short-range, failing the "long-range" requirement for communicating with distant stations or over wide SAR areas. MF-HF SSB voice is the most effective for direct, simultaneous, multi-party long-range coordination.
Related Questions
36E1 What actions should the GMDSS radio operator take prior to any potential Distress situation?36E2 What information should be contained in a detailed Distress message that was not transmitted by an initial Distress “hot-key” alert?36E4 Which statement is NOT true regarding an Inmarsat Distress Alert?36E5 What are the best resources for researching and planning equipment setups and updates prior to any potential Distress situation?36E6 Which statement is true regarding Inmarsat “hot-key” Distress Alerts?