🔍 Key Concepts

• IALA-B lateral buoyage system used in the United States • Relationship between red/right/returning and buoy numbers when coming from seaward • Which shape (can vs nun) is odd-numbered vs even-numbered in the U.S.

💭 Think About

• First, recall the saying used in U.S. waters when you are returning from sea. How does that help you remember buoy colors and numbers? • Think about a green can buoy you might see when entering a harbor from sea. Would its number be odd or even as you come in? • As you proceed from sea into a U.S. channel, do buoy numbers generally go up or down the farther you go inland?

✅ Before You Answer

• Verify how numbers change when returning from seaward in the U.S. system (IALA-B) • Confirm which buoys are can-shaped (green) and their typical numbering (odd or even) • Confirm that the opposite-colored buoys (nun buoys) take the other set of numbers (odd vs even)