587 



Such a vessel may also carry a second whlto light 

 In the position prescribed in subsection (b) of this 

 section but shall not be required to do so. The 

 second white light, if carried, shall be visible at a 

 distance of at least 2 miles and so placed as to be 

 as far as possible visible all round the horizon. 



<b) A vessel of 150 feet or more in length, when 

 at anchor, shall carry near the stem of the vessel, 

 at a height of not less than 20 feet above the hull, 

 one such light, and at or near the stern of the ves- 

 sel and at such a height that it shall be not less 

 than 15 feet lower than the forward light, another 

 such light. Both these lights shall be visible at a 

 distance of at least 3 miles and so placed as to be as 

 far as possible visible all round the horizon. 



(c) Between sunrise and sunset every vessel when 

 at anchor shall carry in the forepart of the vessel, 

 where it can best be seen, one black ball not less 

 than 2 feet In diameter. 



(d) A vessel engaged in laying or in picking up 

 a submarine cable or navigation mark, or a vessel 

 engaged in surveying or underwater operations, 

 when at anchor, shall carry the lights or shapes 

 prescribed in section 1064(c) of this title in addi- 

 tion to those prescribed in the appropriate preceding 

 subsections of this section. 



(e) A vessel aground shall carry the light or 

 lights prescribed in subsections (a) or (b) of this 

 section and the two red lights prescribed In sec- 

 tion 1064(a) of this title. By day she shall carry, 

 where they can best be seen, three black balls, each 

 not less than 2 feet in diameter, placed in a vertical 

 line one over the other, not less than 6 feet apart. 



(f) A seaplane on the water under 150 feet in 

 length, when at anchor, shall carry, where It can 

 best be seen, a white light, visible all round the 

 horizon at a distance of at least 2 miles. 



(g) A seaplane on the water 150 feet or upwards in 

 length, when at anchor, shall carry, where they can 

 best be seen, a white light forward and a white light 

 aft. both lights visible all round the horizon at a 

 distance of at least 3 miles; and. In addition, if the 

 seaplane is more than 150 feet In span, a white 

 light on each side to indicate the maximum span, 

 and visible, so far as practicable, all round the hori- 

 zon at a distance of 1 mile. 



(h) A seaplane aground shall carry on anchor 

 light or lights as prescribed In subsections (f) and 

 (g) of this section, and in addition may carry two 

 red lights in a vertical line, at least 3 feet apart, so 

 placed as to be visible all round the horizon. (Pub. 

 L. 88-131, § 4, Sept. 24, 1963, 77 Stat. 202.) 



§ 1072. Additional lights and siRnals when necessary 

 (Rule 12), 



Every vessel or seaplane on the water may, if 

 necessary In order to attract attention. In addition 

 to the lights which she is by sections 1061 to 1094 of 

 this title required to carry, show a flare-up light or 

 use a detonating or other efficient sound signal that 

 cannot be mistaken for any signal authorised else- 

 where under such sections. (Pub. L. 88-131, § 4, 

 Sept. 24, 1963, 77 Stat. 203.) 



§ 1073. Ships of war, convoy vessels, fishing vessels, 

 and seaplanes on water; naval and military ves- 

 sels and seaplanes of special construction (Rule 

 13). 



(a) Nothing in sections 1061 to 1094 of this title 

 shall interfere with the operation of any special 

 rules made by the Government of any nation with 

 respect to additional station and signal lights for 

 ships of war, for vessels sailing under convoy, for 

 fishing vessels engaged in fishing as a fleet or for 

 seaplanes on the water. 



(b) Whenever the Government concerned shall 

 have determined that a naval or other military ves- 

 sel or waterborne seaplane of special construction 

 or purpose cannot comply fully with the provisions 

 of any of sections 1061 to 1094 of this title with re- 

 spect to the number, position, range or arc of visi- 

 bility of lights or shapes, without interfering with the 

 military function of the vessel or seaplane, such 

 vessel or seaplane shall comply with such other 

 provisions in regard to the number, position, range 

 or arc of visibility of lights or shapes as her Govern- 

 ment shall have determined to be the closest possible 

 compliance with such sections in respect of that 

 vessel or seaplane. (Pub. L. 88-131, § 4. Sept. 24, 

 1963, 77 Stat. 203.) 



§ 1074. Vessels proceeding under sail, when also pro- 

 pelled by machinery (Rule 14). 



A vessel proceeding under sail, when also being 



propelled by machinery, shall carry in the daytime 



forward, where it can best be seen, one black conical 



shape, point downwards, not less than 2 feet In 



diameter at its base. (Pub. L. 88-131, § 4, Sept. 24, 



1963, 77 Stat. 203.) 



SOUND SIGNALS AND CONDUCT IN 

 RESTRICTED VISIBILITY 



§ 1075. General considerations of radar. 



1. The possession of information obtained from 

 radar does not relieve any vessel of the obligation 

 of conforming strictly with sections 1061 to 1094 of 

 this title and, in particular, the obligations con- 

 tained in sections 1076 and 1077 of this title. 



2. The Annex to the Rules contains recommenda- 

 tions intended to assist in the use of radar as an aid 

 to avoiding collision in restricted visibility. (Pub. 

 L. 88-131. § 4. Sept. 24. 1963. 77 Stat, 203. ) 



§ 1076. Sound signals (Rule 15). 



(a) Power-driven, and sailing vessels, 



A power-driven vessel of 40 feet or more in length 

 shall be provided with an efficient whistle, sounded 

 by steam or by some substitute for steam, so placed 

 that the sound may not be intercepted by any ob- 

 struction, and with an efficient fog horn to be 

 sounded by mechanical means, and also with an 

 efficient bell. A sailing vessel of 40 feet or more in 

 length shall be provided with a similar fog horn 

 and bell. 



(b) Methods of sending. 



All signals prescribed in this section for vessels 

 under way shall be given — 



(1) by power-driven vessels on the whistle; 



