🔍 Key Concepts
• NAVAREA warnings purpose and coverage areas
• Difference between coastal/local warnings and long-range (ocean-wide) warnings
• What HYDROLANT and HYDROPAC bulletins are used for
💭 Think About
• First, ask yourself: Are NAVAREA warnings meant just for coastal/harbor navigation, or for ocean‑going, long‑range voyages?
• Consider whether the methods listed (radiotelephone, radiotelegraph, radio‑teletypewriter) are really the usual way modern long‑range warnings are sent, or if some are older/less common systems.
• Think about HYDROLANT and HYDROPAC: do they cover a different type of information than NAVAREA warnings, or mainly the same types of hazards in different ocean regions?
✅ Before You Answer
• Verify the geographic limits of the U.S.-managed NAVAREA in the North Atlantic (is the western boundary at 15°W or a different meridian?).
• Check what kinds of hazards are typically included in NAVAREA warnings, HYDROLANT, and HYDROPAC (e.g., derelict vessels, drifting mines, military exercises, aids to navigation failures).
• Confirm which systems are now standard for long-range MSI (Maritime Safety Information) broadcasts, and whether all three listed in one choice are really "usually" used.