An official website of the United States government
Here's how you know
A .mil website belongs to an official U.S. Department of Defense organization in the United States.
A lock (lock ) or https:// means you’ve safely connected to the .mil website. Share sensitive information only on official, secure websites.

    HOME    |    ABOUT    |    MARINE SAFETY LEADERS    |    CONTACT US   

Announcement: CG-ENG Policy Letter 01-24: Guidance Regarding Devices that Alter Maneuvering Characteristics of Ships

April 22, 2024

On 10 April 2024, the U.S. Coast Guard Office of Design and Engineering Standards (CG-ENG) published Policy Letter 01-24, Guidance Regarding Devices that Alter Maneuvering Characteristics of Ships to Ensure Safe Operation in Waters of the United States.

EPLs and SHaPoLis are just two examples of devices and programs employed on ships to comply with the Energy Efficiency Existing Ship Index as required in MARPOL Annex VI. These devices pose little risk on the open ocean but have the potential to create safety and navigation risks when operating in restricted waters, including harbors and rivers.  

Several Coast Guard Sectors across the nation have issued Marine Safety Information Bulletins regarding the use of power-limiting devices in restricted waters. Additionally, harbor pilots have expressed concerns that ship operators are not fully disclosing the properties of the EPLs and SHaPoLis. This Policy Letter provides further guidance and clarification on the intended use of the devices, when they may need to be disengaged, and provides an assessment framework to facilitate safe navigation in restricted U.S. waterways.

The full text of the policy letter can be found on CG-ENG’s policy website: CG-ENG Policy (

Any questions or feedback related to this Policy Letter should be directed to CG-ENG at


Email Updates!

To sign up for updates or to access your subscriber preferences, please click on the link below.

Subscribe Now!



This blog is not a replacement or substitute for the formal posting of regulations and updates or existing processes for receiving formal feedback of the same. Links provided on this blog will direct the reader to official publications, such as the Federal Register, Homeport and the Code of Federal Regulations. These publications remain the official source for regulatory information published by the Coast Guard.