Rule 22
Visibility of lights
(a) In vessels of 50 metres or more in length:
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a masthead light, 6 miles;
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a sidelight, 3 miles;
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a sternlight, 3 miles;
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a towing light, 3 miles;
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a white, red, green or yellow all-round light, 3 miles.
(b) In vessels of 12 metres or more in length but less than than 50 metres in length:
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a masthead light, 5 miles; except where the length of the vessel is less than 20 metres, 3 miles.
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a sidelight, 2 miles;
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a sternlight, 2 miles;
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a towing light, 2 miles;
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a white, red, green or yellow all-round light, 2 miles.
(c) In vessels of less than 12 metres in length:
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a masthead light, 2 miles;
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a sidelight, 1 miles;
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a sternlight, 2 miles;
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a towing light, 2 miles;
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a white, red, green or yellow all-round light, 2 miles.
(d) In inconspicuous, partly submerged vessels or objects being towed:
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a white all round light, 3 miles.
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