Question 33 UFV02 - Mate - Uninspected Fishing Vessels

The Correct Answer is B **Explanation for Option B (67.5°):** Option B, **67.5°**, is correct because it aligns with the rules concerning lighting arrangements for vessels under both International Regulations for Preventing Collisions at Sea (COLREGS) and Inland Rules. Rule 21(b) defines the sector arc for the Sternlight. The sternlight must be positioned to show an unbroken light over an arc of the horizon of **135 degrees** (112.5° + 22.5°), specifically positioned to show from dead astern to **67.5 degrees** (135° / 2) on each side of the vessel. **Explanation for Incorrect Options:** * **A) 22.5°:** This angle is the required arc of visibility for the masthead light *forward* of the beam (i.e., the arc between the bow and 112.5°), or the angle used in calculating the sidelights' visibility, but it is not the required arc on each side for the sternlight. * **C) 112.5°:** This is the required arc of visibility for the sidelights (green or red light) alone, showing from right ahead to 22.5° abaft the beam. It is not the arc on each side for the sternlight. * **D) 135.0°:** This is the *total* required arc of visibility for the sternlight (covering the entire arc from 67.5° on the starboard quarter to 67.5° on the port quarter). The question asks for the angle "on each side" of the stern, which is half of 135.0°.