MSN 1781 Amendment 2: The merchant shipping regulations 1996: COLREG

Outlines the changes to annex IV of the convention on the international regulations for preventing collisions at sea, 1972 (COLREGs).

This publication was withdrawn on


MSN 1781 (M+F) Amendment 2: The merchant shipping (distress signals and prevention of collisions) regulations 1996: COLREG

Request an accessible format.
If you use assistive technology (such as a screen reader) and need a version of this document in a more accessible format, please email Please tell us what format you need. It will help us if you say what assistive technology you use.


This notice is for:

  • owners
  • masters
  • skippers
  • officers
  • crews


  • merchant ships
  • fishing vessels
  • pleasure vessels
  • yachts
  • other seagoing craft

Updates to this page

Published 1 December 2009
Last updated 5 January 2017 + show all updates
  1. Amendment 2 of MSN 1781 (M + F)

  2. First published.

Sign up for emails or print this page