A+ A A-

A vessel engaged in mine clearance operations underway - lights

  • Description of scenario: Type of vessel: Vessel engaged in mine clearance operations of more than 50 m in length underway
    Time of the day: From sunset to sunrise and from sunrise to sunset in restricted visibility
  • Rule(s) to be applied: Rule 27 (Vessels not under command or restricted in their ability to manoeuvre)
    Rule 23 (Power-driven vessels underway )
  • Applying the Rule(s) and comments: In accordance with Rule 27 (f) (Vessels not under command or restricted in their ability to manoeuvre), a vessel engaged in mine clearance operations shall in addition to the lights prescribed for a power-driven vessel in Rule 23 (Power-driven vessels underway ), exhibit three all-round green lights. One of these lights shall be exhibited near the foremast head and one at each end of the fore yard. These lights indicate that it is dangerous for another vessel to approach within 1000 m of the mine clearance vessel.
    In accordance with Rule 23 (a) (Power-driven vessels underway ), a power-driven vessel underway shall exhibit:
    (i) a masthead light forward;
    (ii) a second masthead light abaft of and higher than the forward one;
    (iii) sidelights ;
    (iv) a sternlight .
  • Lights positions:

    Register for free to have a look at the lights from any direction and/or listen to sound signals!

Advanced COLREGs Course - Visit our advanced course for complex multi-rule and multi-ship scenarios!








This project has been funded with support from the European Commission.This publication reflects the views only of the author, and the Commission cannot be held responsible for any use which may be made of the information contained therein.