If the vessel is within range of NAVTEX...

Question 1 / 27070cVUFXFUmFbV5qOQepSmH

Question 1 of 27070cVUFXFUmFbV5qOQepSmH

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

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Question 1 of 27070

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

🔍 Key Concepts

• Maritime Safety Information (MSI) broadcast methods under GMDSS • Difference between ARQ (Automatic Repeat reQuest) and FEC (Forward Error Correction) in MF/HF telex modes • Standard international MSI frequency 518 kHz and how NAVTEX messages are formatted

💭 Think About

• If NAVTEX and Inmarsat-C are both down, which GMDSS subsystem and mode is designed to receive broadcast MSI without needing a two-way connection? • Does MSI broadcasting normally use an error-correcting one-way broadcast mode or a two-way, handshaking mode? • How are NAVTEX-style MSI messages normally transmitted on MF frequencies: via ARQ, via FEC, or via another method?

✅ Before You Answer

• Verify which mode (ARQ vs FEC) is used for broadcast (one-to-many) MSI on MF/HF • Confirm the standard international MSI / NAVTEX frequency 518 kHz use and associated mode • Ensure the selected option does not require a prior two-way link setup to receive safety broadcasts

Question 1 of 27070

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

Select 518 kHz ARQ TELEX on the MF/HF console to receive MSI.

Request repairs of the Sat-C system and wait until within range of NAVTEX.

Select 518 kHz FEC TELEX on the MF/HF console to receive MSI.

Select an HF MSI frequency and ARQ TELEX mode to receive MSI.

Question 1 / 27070cVUFXFUmFbV5qOQepSmH

Question 1 of 27070cVUFXFUmFbV5qOQepSmH

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

Back

Question 1 of 27070

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