# The River Lagan Tidal Navigation and General Bye-laws (Northern Ireland) 2007, Section 10: Restriction on Navigation by Night, etc.


(1) The master of a vessel navigating during the hours of darkness shall display lights on such vessel as follows, each to be visible over the water to a distance of 1.6 kilometres—
(a) on the mast or at a height of not less than 1.2 metres above the hull, a bright white light, (power driven vessels only), visible from right ahead to 22.5 degrees abaft the beam on either side;
(b) on the starboard side, a green light, visible from right ahead to 22.5 degrees abaft the beam on the starboard side;
(c) on the port side, a red light, visible from right ahead to 22.5 degrees abaft the beam on the port side;
(d) on the stern, a white light, visible from right aft to 22.5 degrees abaft the beam on either side;
(e) any vessel less than seven metres in length may, in lieu of (a) and (b) and (c) display an all-round white light but shall if practicable display side lights;
(f) any vessel with a narrow beam and exceeding 7 metres in length shall display bright white lights on its bow and stern which comply with the requirements of sub-paragraphs (a) and (d).
(2) The master of any vessel aground on the river or moored or anchored other than at a public or private mooring place shall during the hours of darkness display on such vessel a bright white light of such character as to be visible upstream or downstream to a distance of two hundred metres in clear weather conditions.

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Source: https://www.legislation.gov.uk/nisr/2007/243/section/10 (the official version)
Page: https://openlegislation.uk/river-lagan-tidal-navigation-and-general-bye-laws-northern-ireland-2007/section-10
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.