🔍 Key Concepts

• Lateral buoyage system (IALA-B) on U.S. inland rivers – how red vs green aids and their shapes (triangle vs square) mark the channel edges • Descending vs ascending bank on the Mississippi River – how "right/left descending bank" determines the color/shape of fixed aids • Difference between lateral daymarks (channel edge) and diamond-shaped signs (regulatory/informational, not normal channel markers)

💭 Think About

• On the exam chart or reference, determine whether Buckridge Light at mile 412.5 AHP is on the right or left descending bank. How does that bank relate to red vs green aids? • Recall the standard shapes used with red and green lateral marks in U.S. waters. Which color is paired with which shape on fixed dayboards? • Think about what diamond-shaped signs are usually used for (e.g., danger, restricted area). Would that normally be used as the main channel edge daymark on a light structure?

✅ Before You Answer

• Verify from the river chart which bank Buckridge Light is located on (right or left descending). • Confirm which shape goes with red lateral marks and which goes with green in the U.S. system. • Make sure you are not confusing regulatory/information diamonds with standard lateral daymarks used for marking the channel.