Which frequency/mode is authorized for use...

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Question 1 of 20dt4ag10frYViejN1lEzy

Which frequency/mode is authorized for use internationally for Maritime Safety Information transmissions?

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Question 1 of 20

dt4ag10frYViejN1lEzy

Which frequency/mode is authorized for use internationally for Maritime Safety Information transmissions?

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🔍 Key Concepts

• Maritime Safety Information (MSI) broadcasts and which GMDSS systems/frequencies are reserved for them • Difference between FEC (Forward Error Correction) and ARQ (Automatic Repeat reQuest) modes in narrow-band direct printing (NBDP) / radiotelex • Distinction between distress and calling frequencies versus information broadcast frequencies in the MF band (around 4 MHz)

💭 Think About

• First decide: For international MSI broadcasts (like NAVTEX or HF MSI), is the transmission typically one-way to all ships, or a two-way, acknowledged link? How does that affect whether FEC or ARQ is appropriate? • Look at the specific frequencies: which one (4125 kHz or 4209.5 kHz) is normally associated with distress/voice versus data/telex services in the MF/HF maritime bands? • Ask yourself: If all ships worldwide must be able to receive MSI simultaneously without setting up an individual connection, which mode and type of frequency best fits that requirement?

✅ Before You Answer

• Verify which ITU HF MSI frequency around 4 MHz is assigned for NBDP safety broadcasts (not voice distress) • Confirm whether ARQ is used primarily for individual ship–coast links that require acknowledgments, or for general broadcast to all ships • Check if 4125.0 kHz is designated internationally as a distress and calling frequency for radiotelephony (voice), not primarily for MSI telex broadcasts

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Question 1 of 20dt4ag10frYViejN1lEzy

Which frequency/mode is authorized for use internationally for Maritime Safety Information transmissions?

Back

Question 1 of 20

dt4ag10frYViejN1lEzy

Which frequency/mode is authorized for use internationally for Maritime Safety Information transmissions?

No comments yet

Be the first to share your thoughts!

If the question has a related picture, it will appear here.

🔍 Key Concepts

💭 Think About

✅ Before You Answer

👋 Hi! I'm Genie, your AI study assistant. How can I help you with this question?

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