IMO SN/Circ.227
Guidelines for the Installation of a Shipborne Automatic Identification System (AIS)
Published by International Maritime Organization (IMO)
The CFR incorporates IMO SN/Circ.227 by reference, which makes the edition it names part of the regulation. The CFR requires the edition it names, which may not be the newest. To enforce any other edition, the agency must publish the change in the Federal Register.
The edition the CFR requires
IMO SN/Circ.227, January 6, 2003
As the CFR lists it: “SN/Circ.227, Guidelines for the Installation of a Shipborne Automatic Identification System (AIS), January 6, 2003”
- Listed in 33 CFR 164.03(e)(3); required by33 CFR 164.46
How to read it
- Where to get itIMO Publishing ↗
A free or purchased copy may not be the edition the CFR names; check it against the edition above. Every incorporated standard can also be inspected at the National Archives (NARA) and at the agency named in the section that lists it.
IMO SN/Circ.227 is copyrighted by its publisher; RegKnot shows its title and the editions the CFR names, not its text. Read from the eCFR's incorporation-by-reference sections, current as of October 26, 2026. The regulation text governs. All standards the CFR requires.