{"data":{"id":"us/33-cfr-64.21","jurisdiction":"us","citation":"33 CFR 64.21","heading":"Marking and notification requirements.","body":"Before establishing a structure, the owner or operator shall apply for Coast Guard authorization to mark the structure in accordance with § 66.01-5 of this chapter. The appropriate District Commander will determine the marking requirements.","path":["Title 33—Navigation and Navigable Waters","CHAPTER I—COAST GUARD, DEPARTMENT OF HOMELAND SECURITY","SUBCHAPTER C—AIDS TO NAVIGATION","PART 64—MARKING OF STRUCTURES, SUNKEN VESSELS AND OTHER OBSTRUCTIONS","Subpart C—Structures"],"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":"18f009e946f5330cc80eee00f6391d98a62468888081c4d484f332e4baeb6fec","source_id":"us-cfr","stale":true,"prev":"us/33-cfr-64.16","next":"us/33-cfr-64.23"},"notice":"GroundRules: Original legal text. Not legal advice."}