46 CFR § 69.161 - Gross and net register tonnages.

---
identifier: "/us/cfr/t46/s69.161"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "46 CFR § 69.161 - Gross and net register tonnages."
title_number: 46
title_name: "Shipping"
section_number: "69.161"
section_name: "Gross and net register tonnages."
chapter_name: "COAST GUARD, DEPARTMENT OF HOMELAND SECURITY"
subchapter_number: "G"
subchapter_name: "DOCUMENTATION AND MEASUREMENT OF VESSELS"
part_number: "69"
part_name: "MEASUREMENT OF VESSELS"
positive_law: false
currency: "2026-03-24"
last_updated: "2026-03-24"
format_version: "1.1.0"
generator: "[email protected]"
authority: "46 U.S.C. 2301, 14103, 14104; Department of Homeland Security Delegation No. 0170.1."
regulatory_source: "CGD 87-015b, 54 FR 37657, Sept. 12, 1989, unless otherwise noted."
cfr_part: "69"
---


# 69.161 Gross and net register tonnages.

(a) *Gross register tonnage* means the tonnage of a vessel, less certain spaces exempt under § 69.169, and is the sum of the following:

(1) Under-deck tonnage (§ 69.163).

(2) Between-deck tonnage (§ 69.165)

(3) Superstructure tonnage (§ 69.167)

(4) Excess hatchway tonnage (§ 69.115)

(5) Tonnage of framed-in propelling machinery spaces included in calculating gross register tonnage (§ 69.121(d)(1)).

(b) *Net register tonnage* means gross register tonnage less deductions under § 69.119 and § 69.121.

(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.

[CGD 87-015b, 54 FR 37657, Sept. 12, 1989, as amended by USCG-2011-0522, 81 FR 18731, Mar. 31, 2016]