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CFR > Title 33 - Navigation and Navigable Waters > CHAPTER I—COAST GUARD, DEPARTMENT OF HOMELAND SECURITY > SUBCHAPTER E—INLAND NAVIGATION RULES (parts 83 to 90) > PART 86—ANNEX III: TECHNICAL DETAILS OF SOUND SIGNAL APPLIANCES > SUBPART B—Bell or Gong (§86.21 to §86.23) > 86.21—Intensity of signal.
86.21—Intensity of signal.
A bell or gong, or other device having similar sound characteristics shall produce a sound pressure level of not less than 110 dB at 1 meter.