Study purpose only
This site exists to help people learn and remember the collision regulations. It is not an official publication, not a certified course and not legal or professional advice. It does not replace the text published by the International Maritime Organization or by your flag state.
No warranty
The content is provided as it is, without any warranty of accuracy, completeness or fitness for a particular purpose. Rules are amended over time and mistakes in a retelling are possible. Before acting at sea, on an examination or in any legal matter, check the official text.
Limitation of liability
To the fullest extent permitted by law, the author is not liable for any loss, damage, injury, claim or cost arising from the use of this site or from reliance on its content, including navigational decisions, examination results and any indirect or consequential damage.
Quotation of the convention
Short excerpts of the convention are quoted for study and commentary, with the source named. The plain-language retelling, the examples, the diagrams and the flashcards are the author's own work. Do not republish the site as a whole without permission; linking to it is welcome.
External links
Links to imo.org and other sites are given for convenience. We do not control those sites and are not responsible for their content.
Changes
These terms may change. The current version is always the one on this page, and the date of the last update is in the footer.
Contact
Questions and claims: [email protected].