COLREGs Rule 38: Exemptions for older vessels from light and sound rules
Last reviewed: October 14, 2026
Rule 38 lets vessels whose keel was laid before the rules took effect be exempt from certain technical requirements. The International rule sets time-limited and permanent exemptions for lights and sound signal appliances. The Inland rule gives exemptions from the technical Annexes to vessels built before December 24, 1980 that meet listed statutes.
Applies toInternational: vessels whose keel is laid, or which are at a corresponding stage of construction, before the Regulations enter into force and that comply with the 1960 Regulations. Inland: vessels whose keel was laid before December 24, 1980 and that meet the listed statutes.
What it says
International: A vessel that complies with the 1960 International Regulations and was built before these Regulations took effect may be exempted from compliance as the rule lists.
“the keel of which is laid or which is at a corresponding stage of construction before the entry into force of these Regulations may be exempted from compliance therewith as follows:”
International: Such a vessel may be exempt from installing lights with the ranges prescribed in Rule 22 until four years after the date of entry into force of these Regulations.
COLREGs Rule 38(a)“The installation of lights with ranges prescribed in Rule 22, until four years after the date of entry into force of these Regulations.”
International: Repositioning of lights resulting from conversion from Imperial to metric units and rounding off measurement figures is a permanent exemption.
COLREGs Rule 38(c)“The repositioning of lights as a result of conversion from Imperial to metric units and rounding off measurement figures, permanent exemption.”
International: Repositioning of masthead lights on vessels of 150 m or more in length, resulting from section 3(a) of annex I, is exempt until nine years after the date of entry into force of these Regulations.
COLREGs Rule 38(d)(ii)“The repositioning of masthead lights on vessels of 150 m or more in length, resulting from the prescriptions of section 3(a) of annex I to these Regulations, until nine years after the date of entry into force of these Regulations.”
International: Sound signal appliance requirements in annex III are exempt until nine years after the date of entry into force of these Regulations.
COLREGs Rule 38(g)“The requirements for sound signal appliances prescribed in annex III to these Regulations, until nine years after the date of entry into force of these Regulations.”
Inland: A vessel whose keel was laid before December 24, 1980 and that complies with the listed statutes is exempted from the technical Annexes to these Rules (33 CFR parts 84 through 88) as listed.
“shall be exempted from compliance with the technical Annexes to these Rules (33 CFR parts 84 through 88) as follows:”
Inland: Vessels of less than 20 meters in length are permanently exempt from installing lights with the ranges prescribed in Rule 22 (§ 83.22).
COLREGs Rule 38(i)“The installation of lights with ranges prescribed in Rule 22 (§ 83.22), vessels of less than 20 meters in length are permanently exempt.”
Inland: Power-driven vessels of 12 meters or more but less than 20 meters in length are permanently exempt from Rule 23(a)(i) and (iv) if they show a white light aft visible all-round the horizon instead.
COLREGs Rule 38(v)“Power-driven vessels of 12 meters or more but less than 20 meters in length are permanently exempt from the provisions of Rule 23(a)(i) and (iv)”
Common questions
Are sound signal appliances covered by an exemption under the International Rule 38?
Yes. The requirements for sound signal appliances in annex III are exempt until nine years after the date of entry into force of these Regulations.
“The requirements for sound signal appliances prescribed in annex III to these Regulations, until nine years after the date of entry into force of these Regulations.”
Which small vessels are exempt from light range requirements under the Inland Rule 38?
Vessels of less than 20 meters in length are permanently exempt from installing lights with the ranges prescribed in Rule 22 (§ 83.22).
“The installation of lights with ranges prescribed in Rule 22 (§ 83.22), vessels of less than 20 meters in length are permanently exempt.”
Is the metric conversion of light positions exempt under Rule 38?
International: Repositioning of lights from conversion from Imperial to metric units and rounding is a permanent exemption. Inland: such repositioning is permanently exempt.
“The repositioning of lights as a result of conversion from Imperial to metric units and rounding off measurement figures, permanent exemption.”
The text of COLREGs Rule 38
U.S. Coast Guard, Navigation Rules and Regulations Handbook
Rule 38: Exemptions ‡
International (COLREGs)
Any vessel (or class of vessels) provided that she complies with the requirements of the International Regulations for Preventing Collisions at Sea, 1960, the keel of which is laid or which is at a corresponding stage of construction before the entry into force of these Regulations may be exempted from compliance therewith as follows:
(a)The installation of lights with ranges prescribed in Rule 22, until four years after the date of entry into force of these Regulations.
(b)The installation of lights with color specifications as prescribed in Section 7 of annex I to these Regulations, until four years after the date of entry into force of these Regulations.
(c)The repositioning of lights as a result of conversion from Imperial to metric units and rounding off measurement figures, permanent exemption.
(d)(i) The repositioning of masthead lights on vessels of less than 150 m in length, resulting from the prescriptions of Section 3(a) of annex I to these Regulations, permanent exemption. ‡ Per 33 CFR 81.20, each vessel under the 72 COLREGS, except the vessels of the Navy, is exempt from the requirements of the 72 COLREGS to the limitation for the period of time stated in Rule 38 (a), (b), (c), (d), (e), (f), and (g) if: (a) Her keel was laid or is at a corresponding stage of construction before July 15, 1977; and, (b) She meets the International Regulations for Preventing Collisions at Sea, 1960 (77 Stat. 194, 33 U.S.C. 1051-1094).
(d)(continued)
(ii)The repositioning of masthead lights on vessels of 150 m or more in length, resulting from the prescriptions of section 3(a) of annex I to these Regulations, until nine years after the date of entry into force of these Regulations.
(e) The repositioning of masthead lights resulting from the prescriptions of section 2(b) of annex I to these Regulations, until nine years after the date of entry into force of these Regulations.
(f) The repositioning of sidelights resulting from the prescriptions of sections 2(g) and 3(b) of annex I to these Regulations, until nine years after the date of entry into force of these Regulations.
(g) The requirements for sound signal appliances prescribed in annex III to these Regulations, until nine years after the date of entry into force of these Regulations.
(h)The repositioning of all-round lights resulting from the prescription of section 9(b) of annex I to these Regulations, permanent exemption.
Inland Rules
Any vessel or class of vessels, the keel of which was laid or which was at a corresponding stage of construction before December 24, 1980, provided that she complies with the requirements of—
(a) The Act of June 7, 1897 (30 Stat. 96), as amended (33 U.S.C. 154-232) for vessels navigating the waters subject to that statute;
(b) Section 4233 of the Revised Statutes (33 U.S.C. 301-356) for vessels navigating the waters subject to that statute;
(c) The Act of February 8, 1895 (28 Stat. 645), as amended (33 U.S.C. 241-295) for vessels navigating the waters subject to that statute; or
(d) Sections 3, 4, and 5 of the Act of April 25, 1940 (54 Stat. 163), as amended
(46 U.S.C. 526b, c, and d) for motorboats navigating the waters subject to that statute; shall be exempted from compliance with the technical Annexes to these Rules (33 CFR parts 84 through 88) as follows:
(i) The installation of lights with ranges prescribed in Rule 22 (§ 83.22), vessels of less than 20 meters in length are permanently exempt.
(ii) The installation of lights with color specifications as prescribed in Annex I to these Rules (33 CFR part 84), vessels of less than 20 meters in length are permanently exempt;
(iii) The repositioning of lights as a result of conversion to metric units and rounding off measurement figures are permanently exempt.
(iv) The horizontal repositioning of masthead lights prescribed by Annex I to these Rules (33 CFR part 84), vessels of less than 150 meters in length are permanently exempted.
(v) Power-driven vessels of 12 meters or more but less than 20 meters in length are permanently exempt from the provisions of Rule 23(a)(i) and (iv)
(§ 83.23(a)(i) and (iv)) provided that, in place of these lights, the vessel exhibits a white light aft visible all-round the horizon.
Sections it refers to
The plain-English explanation on this page was written with AI from the regulation text above and checked automatically before publishing: every quote appears in the text, every number comes from it, and a second model confirmed each statement adds nothing the text doesn't say. Regulation text current as of August 12, 2024. The regulation text governs. RegKnot is not affiliated with the U.S. Coast Guard.