{"data":{"id":"us/33-cfr-67.20-10","jurisdiction":"us","citation":"33 CFR 67.20-10","heading":"-10 Sound signal.","body":"(a) The owner of a Class “A” structure shall:\n(1) Install a sound signal that has a rated range of at least 2 miles; and,\n(2) Operate the sound signal when the visibility in any direction is less than 5 miles.\n(b) The District Commander may waive any requirements in paragraph (a) of this section if he or she finds that a structure is so close to other structures and so enveloped by the sound signals on other structures that it is not a hazard to navigation.","path":["Title 33—Navigation and Navigable Waters","CHAPTER I—COAST GUARD, DEPARTMENT OF HOMELAND SECURITY","SUBCHAPTER C—AIDS TO NAVIGATION","PART 67—AIDS TO NAVIGATION ON ARTIFICIAL ISLANDS AND FIXED STRUCTURES","Subpart 67.20—Class “A” Requirements"],"source_url":"https://www.ecfr.gov/api/versioner/v1/full/2026-08-25/title-33.xml","current_through":"2026-08-25","vintage":"","retrieved_at":"2026-08-27T02:25:35Z","sha256":"9c7018a6d7f7932036fa5f3b44024c6a969a2a686a3c8f15bb75773bcf560da9","source_id":"us-cfr","stale":true,"prev":"us/33-cfr-67.20-5","next":"us/33-cfr-67.25-1"},"notice":"GroundRules: Original legal text. Not legal advice."}