Colregs Questions and Answers (Q & A)

Rule 17

Action by stand-on vessel

The answers can be found in the respective Rules and Paragraphs in the book"International Regulations for Preventing Collisions at Sea (Colregs) by Capt. Pierre Deseck and/or in the Colregs Presentation (on DVD), also by Capt. Pierre Deseck

Q = Question; A= Answer


Q 17-1
When there is risk of collision between two vessels, sum up the types of actions the stand-on vessel may eventually take ?

A 17-1
Rule 17, (a) (i), (ii) and (b), and Par. 17.1, Application, first paragraph.
Click on action by stand-on vessel for a summary


Q 17-2
What action will normally each vessel take when there is risk of collision ?

A 17-2
Rule 17 (a) and Par. 17.1, Application, second paragraph.
Click on normal action when risk of collision for a summary


Q 17-3
When do both vessels have normally to manoeuvre when there is risk of collision ?

A 17-3
Rule 14 and Par. 17.1, Application, second paragraph, last sentence and Rule 17 (b).
Click on dual action for a summary


Q 17-4
Why is the stand-on vessel required to keep her course and speed when there is risk of collision between two vessels ?

A 17-4
Par. 17.1, Application, fifth paragraph,


Q 17-5
What happens if several vessels are involved in a risk of collision ?

A 17-5
Par. 17.1, Application, sixth paragraph,


Q 17-6
When is the stand-on vessel allowed to take action herself ?

A 17-6
Rule 17 (a) (ii) and Par. 17.2, The stand-on vessel may take action.


Q 17-7
What is the purpose of Rule 17 (a) (ii) ?

A 17-7
Par. 17.2, The stand-on vessel may take action.


Q 17-8
Sum up some situations in which the give-way vessel may not comply with the relevant avoiding rules.

Q 17-8
Par. 17.2, The stand-on vessel may take action, second paragraph.
Click on reasons for not complying for a summary


Q 17-9
How can one justify that the stand-on vessel should not systematically take avoiding action for all give-way vessels ?

A 17-9
Rule 17 (a) (ii) and Par. 17.2, The stand-on vessel may take action, fourth and fifth paragraph.


Q 17-10
Comment in detail the purpose of the action of the stand-on vessel to take avoiding action herself.

A 17-10
Par. 17.2, The stand-on vessel may take action, sixth and seventh par­agraph.
Click on purpose of action by stand-on vessel for a summary


Q 17-11
How can the stand-on vessel be sure that the give-way vessel will not take avoiding action herself ?

A 17-11
Par. 17.2, The stand-on vessel may take action, sixth and eight para­graph.
Click on critera of give-way vessel for a summary


Q 17-12
How can the stand-on vessel manifest her doubts about the give-way vessel not taking avoiding action ?

A 17-12
Par. 17.2, The stand-on vessel may take action, ninth paragraph.
The stand-on vessel may also call the give-way vessel over the VHF or make use of AIS.
Click on how to manifest your doubts for a summary


Q 17-13
What do you understand by the last moment action ?

A 17-13
Rule 17 (b) and Par. 17.3, The last moment action, first paragraph.


Q 17-14
Comment the concept: absolute priority (or absolute privilege).

A 17-14
Par. 17.3, The last moment action, third paragraph.


Q 17-15
Which precautionary measures should the stand-on vessel take before starting a compulsory co-manoeuvre ?

A 17-15
Par. 17.3, The last moment action, fifth paragraph.
Click on precautionary measures for a summary


Q 17-16
What is the least dangerous course of action in case of a compulsory co-manoeuvre ?

A 17-16
Par. 17.3, The last moment action, sixth paragraph.


Q 17-17
Why is altering course to port for a vessel on your own port side to be avoided ?

A 17-17
Rule 17 (c) and Par. 17.4, Avoid altering course to port.


Q 17-18
Comment the notion: Duty of the give-way vessel.

A 17-18
Rule 17 (d) and Par. 17.5, Duty of the give-way vessel. 

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