What is the Notice to Mariners (NTM)?

• A. A free publication that comes in many forms and is the most important source of information for correcting charts and publications
• B. A weekly notice of port operations
• C. A guide to international shipping routes
• D. A registry of all vessels in a port

Answer: (A)

The Notice to Mariners is a free publication issued by national hydrographic offices that provides corrections and updates for navigational charts and publications. It comes in many forms—print, digital, email alerts, or online databases—so mariners can access updates in the format that suits them. It is the primary source for chart corrections and other safety-critical information, including changes to lights, aids to navigation, and new hazards, issued between chart editions. This ensures sailors have the latest information for planning and navigating safely. It is not about port operations, nor a guide to international shipping routes, nor a vessel registry.