🔍 Key Concepts

• Chart corrections and how they are officially distributed • Difference between planning/reference publications and update services • Which publication is issued regularly by hydrographic or government authorities

💭 Think About

• Ask yourself: Which of these options is specifically designed to announce new dangers, changes to buoys, lights, and other navigational information so you can update the chart itself? • Which choices are mainly for general voyage planning or background information rather than line‑by‑line corrections on the chart? • Think about what your ship’s navigator would check each week to pencil in changes on paper charts.

✅ Before You Answer

• Identify which publication is issued frequently with numbered notices to change charts and publications. • Eliminate any options that are mainly climatological or route‑planning summaries, not real‑time corrections. • Confirm which option your licensing exam materials describe as the primary official source for chart and publication updates.