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When, however, a masthead light is carried in addition to sidelights and a sternlight or the all-round light prescribed in Rule 23 d i is carried in addition to sidelights, then such masthead light or all-round light shall be carried at least 1 m higher than the sidelights.
They shall not be so low as to be interfered with by deck lights. On a vessel of 50 m or more in length this forward anchor light shall be placed at a height of not less than 6 m above the hull. The forward light shall be placed not more than one quarter on the length of the vessel from the stem.
They shall be placed at or near the side of the vessel. This light shall be placed not higher than the all-round white light prescribed in Rule 26 c i and not lower than the sidelights. In no case shall the upper of these lights or shapes be at a greater height than the lower of the three lights or shapes prescribed in Rule 27 b i and ii. The sidelights of vessels of 20 m or more in length shall be fitted with inboard screens painted matt black, and meeting the requirements of section 9 of this annex.
On vessels of less than 20 m in length the sidelights, if necessary to meet the requirements of section 9 of this annex, shall be fitted with inboard matt black screens.
With a combined lantern, using a single vertical filament and a very narrow division between the green and red sections, external screens need not be fitted.
The chromaticity of all navigation lights shall conform to the following standards, which lie within the boundaries of the area of the diagram specified for each colour by the International Commission on Illumination CIE. The boundaries of the area for each colour are given by indicating the corner co-ordinates, which are as follows:.
For prescribed lights the value of K shall be 0. NOTE: The maximum luminous intensity of navigation lights should be limited to avoid undue glare. This shall not be achieved by a variable control of the luminous intensity. Non-electric lights shall so far as practicable comply with the minimum intensities, as specified in the table given in section 8 of this annex. Notwithstanding the provisions of paragraph 2 f of this annex the manoeuvring light described in Rule 34 b shall be placed in the same fore-and-aft vertical plane as the masthead light or lights and, where practicable, at a minimum height of 2 m vertically above the forward masthead light, provided that it shall be carried not less than 2 m vertically above or below the after masthead light.
On a vessel where only one masthead light is carried the manoeuvring light is carried, the manoeuvring light, if fitted, shall be carried where it can best be seen, not less than 2 m vertically apart from the masthead light. The construction of light and shapes and the installation of lights on board the vessel shall be to the satisfaction of the appropriate authority of the State whose flag the vessel in entitled to fly.
This project has been funded with support from the European Commission. This publication reflects the views only of the author, and the Commission cannot be held responsible for any use which may be made of the information contained therein. Rule 19 Conduct of vessels in restricted visibility. Rule 20 Application Rule 21 Definitions Rule 22 Visibility of lights Rule 23 Power-driven vessels underway Rule 24 Towing and pushing Rule 25 Sailing vessels underway and vessels under oars Rule 26 Fishing vessels Rule 27 Vessels not under command or restricted in their ability to manoeuvre Rule 28 Vessels constrained by their draught Rule 29 Pilot vessels Rule 30 Anchored vessels and vessels aground Rule 31 Seaplanes.
Rule 32 Definitions Rule 33 Equipment for sound signals Rule 34 Manoeuvring and warning signals Rule 35 Sound signals in restricted visibility Rule 36 Signals to attract attention Rule 37 Distress signals. Rule 38 Exemptions.
Annex I - Positioning and technical details of lights and shapes. Definition The term "height above the hull" means height above the uppermost continuous deck. This height shall be measured from the position vertically beneath the location of the light. Vertical positioning and spacing of lights a On a power-driven vessel of 20 m of more in length the masthead lights shall be placed as follows: i the forwards masthead light, or if only one masthead light is carried, then that light, at a height above the hull of not less than 6 metres, and, if the breadth of the vessel exceeds 6 m, then at a height above the hull not less than such breadth, so however that the light need not be placed at a greater height above the hull than 12 m; ii when two masthead lights are carried the after one shall be at least 4.
Horizontal positioning and spacing of lights a When two masthead lights are prescribed for a power-driven vessel, the horizontal distance between them shall not be less than one half of the length of the vessel but need not be more than m. Details of location of direction-indicating lights for fishing vessels, dredgers and vessels engaged in underwater operations a The light indicating the direction of the outlying gear from a vessel engaged in fishing as prescribed in Rule 26 c ii shall be placed at a horizontal distance of not less than 2 m and not more than 6 m away from the two all-round red and white lights.
Screens for sidelights The sidelights of vessels of 20 m or more in length shall be fitted with inboard screens painted matt black, and meeting the requirements of section 9 of this annex. Shapes a Shapes shall be black and of the following sizes: i a ball shall have a diameter of not less than 0.
Colour specification of lights The chromaticity of all navigation lights shall conform to the following standards, which lie within the boundaries of the area of the diagram specified for each colour by the International Commission on Illumination CIE.
The boundaries of the area for each colour are given by indicating the corner co-ordinates, which are as follows: i White x 0. Range of visibility luminous range of light in nautical miles D.
Convention on the International Regulations for Preventing Collisions at Sea, 1972 (COLREGs)
Annex I - Positioning and technical details of lights and shapes