🔍 Key Concepts

• International & Inland Navigation Rules – Lights and Shapes for special vessel types • The definition and lighting requirements for air-cushion vessels (hovercraft) • How flashing yellow lights differ from red, green, and white lights used for other special conditions (NUC, towing, diving)

💭 Think About

• For each option, recall (or look up) the specific light requirements: what color(s), how many, and in what arrangement are used for that type of vessel? • Ask yourself: which of these vessel types is associated with a distinctive warning light to show its special operating mode, rather than an emergency or restriction in maneuverability? • Consider whether an all-round flashing yellow light is meant to show a hazard to navigation, restricted maneuverability, or a high-speed/special operating condition.

✅ Before You Answer

• Verify in the Navigation Rules which vessel type is explicitly stated to display an all-round flashing yellow light (both International & Inland). • Check that you are not confusing red lights in a vertical line (e.g., vessel not under command) with flashing yellow lights. • Confirm that vessels engaged in diving operations and towing submerged objects have different required light and shape combinations (not a single all-round flashing yellow light).