🔍 Key Concepts

• Intracoastal Waterway (ICW) markings and how they are shown on aids to navigation • Meaning of yellow symbols (squares and triangles) on buoys and dayboards in addition to red/green lateral marks • Difference between information/regulatory buoys and lateral aids used for navigation channels

💭 Think About

• Ask yourself: when you see a normal green buoy, what does that mean in the standard lateral system? Then, what extra information is being added by the yellow triangle? • Think about where the Intracoastal Waterway often overlaps with other channels. How does the Coast Guard show you both the regular channel side and the ICW side on the same mark? • Consider what types of buoys are used to mark hazards, off-station aids, or mistaken positions. Do they normally use yellow triangles for that purpose?

✅ Before You Answer

• Verify what a yellow triangle versus a yellow square means on ICW aids to navigation • Confirm whether information/regulatory buoys are normally colored red/green with lateral shapes, or if they have distinct shapes (e.g., white with orange bands and symbols) • Check the chart legend or Light List section that explains ICW aids and how yellow symbols modify standard red/green meaning