🔍 Key Concepts

• Intracoastal Waterway (ICW) markings and what the yellow square means • Differences between shape, color, and lighting characteristics of aids to navigation • How chart symbols show whether an aid is lighted or unlighted

💭 Think About

• Look at what a yellow square specifically indicates in the ICW system—does it say anything about lighting? • Which of the listed features (shape, color, part of ICW, lighted) are definitively tied to the yellow square symbol itself? • On a chart, how would you confirm if an aid is lighted—do you rely on the yellow square, or some other symbol/notation?

✅ Before You Answer

• Verify the meaning of a yellow square in the ICW on a chart legend or Light List • Check how charts indicate a lighted aid (what extra symbols or text are used) • Confirm whether the ICW symbol alone guarantees that the aid is lighted or if that must be shown separately