[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: 33CFR86.07]



[Page 218]

 

                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. 86.07  Directional properties.



    The sound pressure level of a directional whistle shall be not more 

than 4 dB below the sound pressure level specified in Sec. 86.05 in any 

direction in the horizontal plane within 45 

degrees of the forward axis. The sound pressure level of the whistle in 

any other direction in the horizontal plane shall not be more than 10 dB 

less than the sound pressure level specified for the forward axis, so 

that the range of audibility in any direction will be at least half the 

range required on the forward axis. The sound pressure level shall be 

measured in that one-third octave band which determines the audibility 

range.