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The masthead light should be visible in a 225 degree arc centered on dead ahead.
If you are operating a powerboat at night your green side light must be visible to boats approaching over an arc of the horizon 112.5 degrees and so fixed as to show the the light from right ahead to 22.5 degrees abaft of the beam on its respective side.
Rule 21 of the Navigational Rules of the Road. (a) "Masthead light" Means a white light placed over the fore and aft center-line of the vessel showing an unbroken light over an arc of the horizon of 225 degrees and so fixed to show the light from right ahead to 22.5 degrees abaft of the beam on either side of the vessel, except that on a vessel of less than 12 meters (39'4") in length the masthead light shall be placed as nearly as practical to the fore and aft center-line of the vessel.
A powerboat less than 39.4 feet long is anchored at night white light must be visible from all directions.
It is my understanding that you are taking the boater test. It is head on and port.
A white light on a powerboat (that obviously doesn't have a mast) must be displayed so as to be visible from 360 degrees.
You are approaching a powerboat head-on
You are approaching a powerboat head-on
You are approaching a powerboat head-on
Visible light causes reflection of light in all directions
Bubbles visible in the glass with the system operating.Bubbles visible in the glass with the system operating.
It is called the Tyndall effect.