🔍 Key Concepts

• Intracoastal Waterway (ICW) symbols on existing red and green aids to navigation • How yellow shapes are used to show the preferred channel when the ICW and a local channel share the same buoy or daymark • Difference between shapes used for regulatory/information signs and those used for ICW route indication

💭 Think About

• Which of these shapes can you picture as small yellow symbols superimposed on normal red or green buoys to show the ICW preferred side? • When a vessel is following the ICW, what shape tells you to keep that mark on your starboard side, and what shape tells you to keep it on your port side? • Looking at the four shapes, which two are most commonly seen paired on opposite sides of a channel rather than standing alone as warnings or information markers?

✅ Before You Answer

• Be sure you are thinking about ICW preferred channel marks, not junction buoys or regulatory signs. • Confirm that the two shapes you select are used together as opposites (one for each side of the channel). • Verify that your chosen shapes are simple geometric marks (not divided or multi‑sided warning symbols).