Rule 23: Power Driven Vessels Underway | Lights & Shapes In Depth

✔ Casual Animation is made by sailors with a love of animation.
✔ If you would like to use any of our animated content in your own projects, we would love to hear from you. Contact details in the “About” page.
---------ABOUT THE VIDEO---------
This video was originally uploaded to our other channel, Casual Navigation, back in 2018.
This video is an "in depth" look at Rule 23 of the International Regulations for Preventing Collisions at Sea. Rule 23 continues the section looking at Light and Shapes of different vessels. This rule defines the lights that a power driven vessel underway is obliged to exhibit.
---------RULE 23---------
Rule 23: Power-driven vessels underway
(a) A power-driven vessel underway shall exhibit:
i. a masthead light forward;
ii. a second masthead light abaft of and higher than the forward one; except that a vessel of less than 50 metres in length shall not be obliged to exhibit such light but may do so;
iii. sidelights;
iv. a sternlight.
(b) An air-cushion vessel when operating in the non-displacement mode shall, in addition to the lights prescribed in paragraph (a) of this Rule, exhibit an all-round flashing yellow light.
(c) A WIG craft only when taking off, landing and in flight near the surface shall, in addition to the lights prescribed in paragraph (a) of this Rule, exhibit a high intensity all-round flashing red light.
(d)
i. A power-driven vessel of less than 12 metres in length may in lieu of the lights prescribed in paragraph (a) of this Rule exhibit an all-round white light and sidelights;
ii. a power-driven vessel of less than 7 metres in length whose maximum speed does not exceed 7 knots may in lieu of the lights prescribed in paragraph (a) of this Rule exhibit an all-round white light and shall, if practicable, also exhibit sidelights;
iii. the masthead light or all-round white light on a power-driven vessel of less than 12 metres in length may be displaced from the fore and aft centre line of the vessel if centreline fitting is not practicable, provided that the sidelights are combined in one lantern which shall be carried on the fore and aft centre line of the vessel or located as nearly as practicable in the same fore and aft line as the masthead light or the all-round white light.
---------DISCLAIMER---------
Although we take all reasonable care to ensure the accuracy and reliability of the information provided in the content on this channel, the content is provided “as is”. We do not make any warranties about the accuracy, content, completeness, legality or reliability of the information contained within this channel.
The information contained within our videos is not professional or legal advice and should not be considered as such. If you need professional or legal advice, you should consult a suitably qualified professional.
Any action you take as a result of watching this video is strictly at your own risk.

[@gilbartolome5723]

It's well worth watching. Thanks

[@shin7328]

Thanks mate !

[@louisrussell8267]

Such a great referance cheers

[@colmwhelan9198]

Great ❤

[@marioctg]

congrats!

[@sanjuicesam]

Can u explain the part 23 d(iii) with diagram?

[@de5792]

That one is indeed a bit confusing.

[@paterson00]

Another great video. Thanks again for creating.
I drive a 6.1m bowrider here in Australia and at night a while back I was stopped by police for my combined sidelights not working. I was only travelling at 5 knots and would only travel at that speed all night as we were cruising canals on an Xmas light tour. It just occurred to me watching this video that I needn't have worried and the police needn't have stopped me as my all round white light was working fine. It was just a loose bulb in the holder so no big issue but none the less... not that I objected to them stopping me, they were just being helpful.
We weren't stopped in this video but this is the cruise area. Very nice way to welcome in Christmas here in Australia.
ruclips.net/video/hB6mr2cVWDY/видео.html

[@CasualNavigationAcademy]

Looks like a lovely cruising area

[@paterson00]

@@CasualNavigationAcademy Mandurah in Western Australia. Perfect for boating.

[@RonyGazder-pr8rl]

good explanation but it would be better if you could have shown the lights for vessel less than 7 and 12 mtrs also

[@asifuddinshaikh1117]

Sir please add more videos on this channel

[@romeojrferrer1299]

Hi, I'm a Filipino merchant marine officer, but now into teaching, can i copy your videos for educational purposes only. Thank you very. much in advance