🔍 Key Concepts

• Lateral buoyage system (IALA B in the United States) • Shapes and colors of daymarks used for aids to navigation • Difference between lateral marks (marking channel sides) and non‑lateral marks (information or special purpose)

💭 Think About

• In the U.S. lateral system, what color and shape are used for aids on the starboard side of a channel when returning from sea? • What is the purpose of a triangular red daymark mounted on a pile or structure compared to a buoy that floats? • Which choices describe functions that do NOT relate to marking the sides of a channel?

✅ Before You Answer

• Match the color (red) and shape (triangle) to their role in the IALA B lateral system • Eliminate any options that describe centerline or general information marks, since those use different shapes/colors • Confirm that a daymark is a fixed sign on a structure, used as a lateral aid, not normally a special-purpose or mid‑channel mark