BOTH INTERNATIONAL & INLAND In illustration...

Question 1 / 2707066636eeb28f7522a1c51bac0

Question 1 of 2707066636eeb28f7522a1c51bac0

BOTH INTERNATIONAL & INLAND In illustration D023RR below which represents the arc of visibility of a red sidelight?

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Question 1 of 27070

BOTH INTERNATIONAL & INLAND In illustration D023RR below which represents the arc of visibility of a red sidelight?

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🔍 Key Concepts

• Navigation Rules Rule 21 - Definitions, especially the definition of sidelights • Remember: red sidelight = port (left) side; green sidelight = starboard (right) side • The required arc of visibility for each sidelight is 112.5° (from dead ahead to 22.5° abaft the beam)

💭 Think About

• Imagine you are looking at the vessel from above: bow at the top of the box, stern at the bottom, port to the left and starboard to the right. On which side should the red sidelight be visible? • A quarter circle is only 90°. The sidelight must show 112.5°. Which figure shows a sector that is just more than a quarter circle, extending a little aft of the beam? • From directly ahead, you should see both sidelights. From a little abaft the port beam, you should still just see the red. Which diagram matches that behavior on the port side?

✅ Before You Answer

• Verify in Rule 21 that sidelights show from dead ahead to 22.5° abaft the beam, total 112.5° • Confirm that port = left side when looking forward from the stern towards the bow • Check which option’s shaded sector starts at the bow (top center) and extends along the port (left) side slightly past the beam, matching 112.5° of coverage

Question 1 of 27070

BOTH INTERNATIONAL & INLAND In illustration D023RR below which represents the arc of visibility of a red sidelight?