BOTH INTERNATIONAL & INLAND In illustration...

Question 1 / 2707066636eeb28f7522a1c51babe

Question 1 of 2707066636eeb28f7522a1c51babe

BOTH INTERNATIONAL & INLAND In illustration D023RR below item "A" represents the arc of visibility of which of the following lights?

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Question 1 of 27070

BOTH INTERNATIONAL & INLAND In illustration D023RR below item "A" represents the arc of visibility of which of the following lights?

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🔍 Key Concepts

• Rule 21 – Definitions in the Navigation Rules (masthead light, sidelight, sternlight) • Standard arcs of visibility: masthead light 225°, sidelights 112.5° each, sternlight 135° • How these arcs are positioned relative to the ship’s bow and stern

💭 Think About

• Look at item "A" and decide: is this sector centered more toward the bow or the stern of the vessel? • Compare the approximate size of the dark sector in item "A" with 360°. Is it closer to one quarter-circle, a bit more than a quarter, or a bit more than a third? • Ask yourself which lights are seen only from ahead, only from astern, or from both ahead and astern.

✅ Before You Answer

• Verify from Rule 21 that sidelights are 112.5° measured from right (or left) ahead to just abaft the beam. • Verify that the stern light is 135° centered on the stern and not visible right ahead. • Confirm that the masthead light is 225° and extends from just abaft the beam on one side, through ahead, to just abaft the beam on the other side.

Question 1 of 27070

BOTH INTERNATIONAL & INLAND In illustration D023RR below item "A" represents the arc of visibility of which of the following lights?

stern light

white masthead light

red sidelight

green sidelight