If the vessel is within range of NAVTEX broadcasts and both the Inmarsat-C and the NAVTEX receiver are inoperative the GMDSS operator should:

Correct Answer: Option D — Select 518 kHz FEC TELEX on the MF/HF console to receive MSI.

When NAVTEX is unavailable, MSI is disseminated via MF/HF NBDP. FEC mode is used for these broadcasts because they are one-way transmissions from coast stations to multiple vessels. Tuning to 518 kHz in FEC mode allows the vessel to receive the standard international NAVTEX-equivalent information via MF.