[Code of Federal Regulations]

[Title 33, Volume 1]

[Revised as of July 1, 2005]

From the U.S. Government Printing Office via GPO Access

[CITE: 33CFR86.13]



[Page 219]

 

                TITLE 33--NAVIGATION AND NAVIGABLE WATERS

 

         CHAPTER I--COAST GUARD, DEPARTMENT OF HOMELAND SECURITY

 

PART 86_ANNEX III: TECHNICAL DETAILS OF SOUND SIGNAL APPLIANCES--Table 

of Contents

 

                           Subpart A_Whistles

 

Sec. 86.13  Combined whistle systems.



    (a) A combined whistle system is a number of whistles (sound 

emitting sources) operated together. For the purposes of the Rules a 

combined whistle system is to be regarded as a single whistle.

    (b) The whistles of a combined system shall:

    (1) Be located at a distance apart of not more than 100 meters,

    (2) Be sounded simultaneously,

    (3) Each have a fundamental frequency different from those of the 

others by at least 10 Hz, and

    (4) Have a tonal characteristic appropriate for the length of vessel 

which shall be evidenced by at least two-thirds of the whistles in the 

combined system having fundamental frequencies falling within the limits 

prescribed in Sec. 86.03, or if there are only two whistles in the 

combined system, by the higher fundamental frequency falling within the 

limits prescribed in Sec. 86.03.



    Note: If due to the presence of obstructions the sound field of a 

single whistle or of one of the whistles referred to in Sec. 86.11 is 

likely to have a zone of greatly reduced signal level, a combined 

whistle system should be fitted so as to overcome this reduction.