{"data":{"id":"us/46-cfr-69.161","jurisdiction":"us","citation":"46 CFR 69.161","heading":"Gross and net register tonnages.","body":"(a) Gross register tonnage means the tonnage of a vessel, less certain spaces exempt under § 69.169, and is the sum of the following:\n(1) Under-deck tonnage (§ 69.163).\n(2) Between-deck tonnage (§ 69.165)\n(3) Superstructure tonnage (§ 69.167)\n(4) Excess hatchway tonnage (§ 69.115)\n(5) Tonnage of framed-in propelling machinery spaces included in calculating gross register tonnage (§ 69.121(d)(1)).\n(b) Net register tonnage means gross register tonnage less deductions under § 69.119 and § 69.121.\n(c) The authorized measurement organization must issue a U.S. Tonnage Certificate as evidence of a vessel's measurement under this subpart, which must also indicate the vessel's measurement under the Convention Measurement System in subpart B of this part, if applicable. There is no requirement to maintain the U.S. Tonnage Certificate on board the vessel.","path":["Title 46—Shipping","CHAPTER I—COAST GUARD, DEPARTMENT OF HOMELAND SECURITY","SUBCHAPTER G—DOCUMENTATION AND MEASUREMENT OF VESSELS","PART 69—MEASUREMENT OF VESSELS","Subpart D —Dual Regulatory Measurements System"],"source_url":"https://www.ecfr.gov/api/versioner/v1/full/2026-08-25/title-46.xml","current_through":"2026-08-25","vintage":"","retrieved_at":"2026-08-27T02:26:22Z","sha256":"5f9d373a3901b70ef45ed839a1970a7f3f3a16bd103c39a55f48936576192b89","source_id":"us-cfr","stale":true,"prev":"us/46-cfr-69.159","next":"us/46-cfr-69.163"},"notice":"GroundRules: Original legal text. Not legal advice."}