A+ A A-

Alteration of course alone

  • Rule(s) to be applied: Rule 8 (Action to avoid collision )
  • Applying the Rule(s) and comments: In accordance with Rule 8 (c) (Action to avoid collision ), if there is sufficient sea-room, alteration of course alone may be the most effective action to avoid a close-quarters situation provided that it is made in good time, is substantial and does not result in another close-quarters situation.
    Generally, speed alteration is rather difficult to observe as such is difficult to assess the situation, because, the apparent track remains the same. Thus, a course alteration is much more effective in diffusing a dangerous situation and also is readily apparent to the other vessel – provided however, that the alteration can be observed very easily by the other vessel.

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

Improve your Maritime English, assess your level of knowledge and obtain a completion certificate
for free!


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.