Question 721Rules of the Road90% to pass
BOTH INTERNATIONAL & INLAND The white masthead light required for a powerdriven vessel under the Rules is visible over how many degrees of the horizon?
AI Explanation
The correct answer is C) 225.0°.
The International and Inland Navigation Rules require a power-driven vessel to exhibit a white masthead light that is visible over an arc of the horizon of 225.0 degrees. This is specified in Rule 21(a) of the Navigation Rules, which states that the masthead light shall be placed as nearly as practicable to the fore and aft centerline of the vessel and shall show an unbroken light over an arc of the horizon of not less than 225 degrees and so fixed as to show the light from right ahead to 22.5 degrees abaft the beam on either side of the vessel.
The other answer choices are incorrect because option A) 022.5° is too narrow, option B) 112.5° is too narrow, and option D) 360.0° is too wide for the required arc of visibility for the white masthead light on a power-driven vessel.
Related Questions
#719 BOTH INTERNATIONAL & INLAND Vessel "A" is overtaking vessel "B" as shown in illustration D017RR below. Vessel "B" is an air-cushion vessel operating in the non-displacement mode. In addition to a steady white light which other light will vessel "A" observe on vessel "B"? #720 BOTH INTERNATIONAL & INLAND The stern light shall be positioned such that it will show from dead astern to how many degrees on each side of the stern of the vessel? #722 BOTH INTERNATIONAL & INLAND What type of vessel displays the lights as shown in illustration D082RR? #723 BOTH INTERNATIONAL & INLAND In illustration D023RR below "B" represents the arc of visibility of which of the following? #724 BOTH INTERNATIONAL & INLAND Which of the following describes a vessel exhibiting the lights shown in illustration D084RR below?