🔍 Key Concepts

• Towing light definition in the Navigation Rules (Annex I and Rule 21) • How a sternlight is defined compared to other lights • The phrase "same characteristics as" in reference to color, arc of visibility, and placement

💭 Think About

• Which of the listed lights shines over a specific sector aft of the vessel, and is used to show the vessel’s rear aspect? • If a towing light is yellow, which other light (by definition) has the same arc of visibility but is normally white? • Look at how masthead lights, sidelights, and sternlights each cover different arcs — which one best matches what you would expect for a light showing the direction of the tow behind the vessel?

✅ Before You Answer

• Verify in Rule 21 the exact wording: a towing light is a yellow light with the same characteristics as which other light? • Confirm the arc of visibility in degrees for each type of light listed in the choices. • Double‑check that an all-round light shows 360° and ask if that would be appropriate for a towing light that’s meant to show mainly astern.