Subelement B: MF-HF-DSC-SITOR (NBDP) Equip. & Operations— Topic :
Question 21B5
Element 9 (GMDSS Maintainer)If the vessel is beyond range of NAVTEX broadcasts and the Sat-C system fails, the GMDSS operator must:
Explanation
When a vessel is beyond the range of NAVTEX (which uses MF 518 kHz) and the Sat-C EGC system for receiving Maritime Safety Information (MSI) fails, the GMDSS operator must utilize the next available compliant method. High Frequency (HF) communications are used for long-range transmissions.
HF Narrow-Band Direct Printing (NBDP) in the Forward Error Correction (FEC) TELEX mode is a designated GMDSS method for receiving MSI over long distances when other systems are unavailable. This ensures the vessel can still receive vital weather, navigation, and other safety broadcasts.
Options B and D are incorrect because 518 kHz is the NAVTEX frequency, and the problem explicitly states the vessel is *beyond range* of NAVTEX broadcasts. Option C is incorrect because waiting for repairs or to re-enter range is not an acceptable GMDSS procedure; the operator must take immediate action to ensure continuous receipt of MSI.
Related Questions
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