33 C.F.R. § 86.21 Intensity of signal.
Title 33 - Navigation and Navigable Waters
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.
Title 33: Navigation and Navigable Waters
PART 86—ANNEX III: TECHNICAL DETAILS OF SOUND SIGNAL APPLIANCES
Subpart B—Bell or Gong
§ 86.21 Intensity of signal.
