🔍 Key Concepts

• U.S. Aids to Navigation System on the Western Rivers (remember: Belle Island Corner Light is an inland river aid) • The meaning of red vs. green aids when going upriver (Against Head of Passes / AHP) • The standard shapes of dayboards/daymarks that go with red and green lateral marks in Region B/Western Rivers

💭 Think About

• First, decide: at mile 458.6 AHP on the river, are you conceptually going upbound or downbound when reading the chart, and which side are the red aids on? • Recall the pairings: what shape is normally used for green lateral aids, and what shape is normally used for red lateral aids on U.S. inland waters? • Ask yourself: is a diamond normally used for lateral (port/starboard) marks, or for something else like ranges or special marks?

✅ Before You Answer

• Verify on a sample river chart or chart legend what symbol/shape is used for green lateral aids vs. red lateral aids. • Confirm what AHP (Above Head of Passes) implies about river mileage and direction of buoy numbering and colors. • Double‑check in the U.S. Aids to Navigation System that the standard lateral daymark shapes are consistent whether on buoys or fixed daybeacons.