Maritime Safety Information & NAVTEX Flashcards

What does the abbreviation MSI stand for in the context of maritime communications?

Answer: Maritime Safety Information

MSI stands for Maritime Safety Information — the collective term for navigational warnings, meteorological warnings, weather forecasts, and other urgent safety messages broadcast to mariners as part of the GMDSS.

On what frequency does NAVTEX broadcast international Maritime Safety Information in English?

Answer: 518 kHz (medium frequency)

NAVTEX broadcasts international MSI in English on 518 kHz in the medium frequency (MF) band. A separate frequency of 490 kHz is used for national-language broadcasts. NAVTEX is entirely separate from VHF radio communications.

What is the primary operational advantage of a dedicated NAVTEX receiver on board?

Answer: It automatically receives and stores MSI messages without a radio operator needing to listen continuously

A NAVTEX receiver monitors its dedicated frequency automatically and prints or displays incoming MSI messages — navigational warnings, weather forecasts, and safety notices — without requiring a radio operator to be present or actively listening. This is especially valuable for short-handed crews.

In the UK, which organisation is primarily responsible for coordinating the broadcast of Maritime Safety Information to small craft on VHF?

Answer: HM Coastguard (HMCG)

HM Coastguard (HMCG), which is part of the Maritime and Coastguard Agency (MCA), is responsible for coordinating and broadcasting MSI to mariners in UK waters, including weather forecasts, navigational warnings, and urgent safety notices on VHF.

On which VHF channel does HM Coastguard broadcast routine weather forecasts and navigational warnings for small craft in UK waters?

Answer: Channel 67

HM Coastguard broadcasts routine small craft weather forecasts and navigational warnings on Channel 67, which is designated as the UK Small Craft Safety channel. Broadcasts are announced on Channel 16 first, after which mariners switch to Channel 67 to receive the information.

Which of the following types of information is included in a Maritime Safety Information broadcast?

Answer: Navigational warnings, meteorological warnings, and weather forecasts

MSI broadcasts include navigational warnings (unlit objects, buoy discrepancies, wreck positions), meteorological warnings (gale warnings), weather forecasts, and other urgent safety-related notices. This information is essential for safe voyage planning under GMDSS.