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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 A—Whistles (§86.01 to §86.15) > 86.11—Fitting of more than one whistle.
86.11—Fitting of more than one whistle.
If whistles are fitted at a distance apart of more than 100 meters, they shall not be sounded simultaneously.