Colregs Questions and Answers (Q & A)

Rule 19

Conduct of vessels in restricted visibility

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 19-1
To what vessels and where does Rule 19, Conduct of vessels in restrict­ed visibility, apply ?

A 19-1
Rule 19 (a) and Par 19.1, Application, second and third paragraph.
Click on what vessels for a summary


Q 19-2
What norm can you consider to determine if visibility is restricted ?

A 19-2
Par 19.1, Application, sixth paragraph.
Click on when is visibility restricted for a summary


Q 19-3
What are the means that allow you to assess visibility at a given mo­ment ?

A 19-3
Par 19.1, Application, eight paragraph.
Click on means to assess vibility for a summary


Q 19-4
 When is a vessel required to give fog signals ?

A 19-4
Par 19.1, Application, seventh paragraph.


Q 19-5
 What speed should you maintain in or near an area of restricted visibility ?

A 19-5
Rule 19 (b) and Par 19.2, Safe speed, first paragraph.


Q 19-6
 What precautionary measure should a power-driven vessel take in or near an area of restricted visibility ?

A 19-6
Rule 19 (b) and Par 19.2, Safe speed, third paragraph.


Q 19-7
 Give some factors which determine maintaining a safe speed.

A 19-7
Par 19.2, Safe speed, second paragraph.
Click on safe speed for a summary


Q 19-8
 Which precautionary measures shall a sailing vessel take in or near an area of restricted visibility ?

A 19-8
Par 19.2, Safe speed, fourth paragraph.
Click on sailing vessels for a summary


Q 19-9
 Which safety measures are prescribed in Section I of Part B in relation to the prevailing circumstances and conditions of restricted visibility ?

A 19-9
Rule 19 (c) and Par 19.3, Safety measures prescribed in Section I of Part B.
Click on safety measures prescribed for a summary


Q 19.10
 What must you do when you detect by radar alone the presence of an­other vessel ?

A 19 10
Rule 19 (d) and Par 19.4, Detection by radar alone.


Q 19-11
 Explain what you understand by: if, by radar alone, you detect that a close-quarters situation is developing and/risk of collision exist, take avoiding action in ample time.

A 19-11
Rule 19 (d) and Par 19.4, Detection by radar alone, fifth paragraph.


Q 19-12
 If, in connection with Rule 19 (d), avoiding action consists of an altera­tion of course, what shall you, so far as possible, avoid ?

A 19-12
Rule 19 (d) (i) and (ii) and Par 19.4, Detection by radar alone, fifth par­agraph, points 1 and 2 and seventh paragraph .
Click on avoiding action for a summary


Q 19-13
 Explain why the term “apparently” has been inserted in Rule 19 (e).

A 19-13
Rule 19 (e) and Par 19.5, Fog signal apparently forward of the beam, when there is risk of collision.


Q 19-14
 What precautionary measures shall a vessel take when she hears the fog signal apparently forward of the beam of another vessel or cannot avoid a close quarters situation with another vessel forward of her beam ?

A 19-14
Rule 19 (e) and Par 19.5, Fog signal apparently forward of the beam, when there is risk of collision, sixth paragraph.
Click on fog signal for a summary


Q 19-15
 What does the term “another vessel” mean ?

A 19-15
Rule 19 (e) and Par 19.5, Fog signal apparently forward of the beam, when there is risk of collision, seventh paragraph.


Q 19-16
 What are the elements that determine the minimum speed at which a vessel can just be kept on course ?

A 19-16
Par 19.5, Fog signal apparently forward of the beam, when there is risk of collision, eight paragraph.


Q 19-17
 What are the advantages of taking all way off the vessel ?

A 19-17
Par 19.5, Fog signal apparently forward of the beam, when there is risk of collision, ninth paragraph.
Click on advantages of all way off for a summary


Q 19-18
 In which cases may it be necessary to take all way off the vessel ?

A 19-18
Par 19.5, Fog signal apparently forward of the beam, when there is risk of collision, tenth paragraph.
Click on taking all way off is necessary for a summary


Q 19-19
 Which fog signal shall a power-driven vessel give when she doesn’t make way through the water anymore ?

A 19-19
Par 19.5, Fog signal apparently forward of the beam, when there is risk of collision, eleventh paragraph.


Q 19-20
 Comment what you understand by: as soon as all way is taken off, the vessel shall navigate with extreme caution until all danger of collision is past.

A 19-20
Par 19.5, Fog signal apparently forward of the beam, when there is risk of collision, twelfth paragraph.
Click on navigate with extreme caution for a summary


Q 19-21
 When can you assume that risk of collision is past when navigating in or near an area of restricted visibility ?

A 19-21
Par 19.5, Fog signal apparently forward of the beam, when there is risk of collision, thirteenth paragraph.
Click on risk of collision is assumes to be past for a summary


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