Forums > Deck > Rules of the Road: BOTH INTERNATIONAL & INLAND The arc of visibility for sidelights ...
| Question #1598 | |
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| BOTH INTERNATIONAL & INLAND The arc of visibility for sidelights is from right ahead to what degree? | |
| A) 135° abaft the beam | |
| B) abeam | |
| C) 22.5° forward of the beam | |
| D) 22.5° abaft the beam | |
| Posted: 15 May 2019 17:02 UTC | Post #1 |
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| radraft62518 Deck & Engine |
Member Total Posts: 2 |
| I guess right on this one, but can someone explain.... sidelights are 112.5. abaft the beamyou can only see 22.5 degrees? | |
| Posted: 26 May 2019 21:17 UTC | Post #2 |
| golivi Deck |
Member Total Posts: 37 |
| This one is right out of Rule 21 which says sidelights show "an unbroken light over an arc of the horizon of 112.5 degrees and so fixed as to show the light from right ahead to 22.5 degrees abaft the beam on its respective side". So, in other words, from straight ahead, through the beam which is 90 degrees, then through an additional 22.5 degrees abaft the beam. So, 90 degrees plus 22.5 degrees is a total arc of visibility of 112.5 degrees. | |
| Posted: 12 Oct 2021 14:53 UTC | Post #3 |
| captainchipship69 Deck |
Member Total Posts: 20 |
| Mast headlight shows 225° and a stern light shows 135°That’s combine together makes 360° not rocket science | |
| Posted: 12 Oct 2021 23:10 UTC | Post #4 |
| captainchipship69 Deck |
Member Total Posts: 20 |
| I’ll explain it as simple as possible 112.5 equals 225 plus 135° Equals 360° so that’s when you were coming up from the start of a vessel either on the port side of the starboard side you start to see either side light before 90° | |
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