Colregs Questions and Answers (Q & A)

Rule 15

Crossing situation

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 15-1 When are two vessels crossing each other ?

A 15-1
Par. 15.2, Crossing situation.
Click on crossing situation for a summary


Q 15-2
To what type of vessels does Rule 15, Crossing situation, apply ?

A 15-2
Rule 15 and Par. 15.1, General.
Click on types of vessels for a summary


Q 15-3
To what type of vessels does Rule 15, Crossing situation not apply ?

A 15-3
Rule 15 and Par. 15.1, General.
Click on types of vessels for a summary


Q 15-4
When can you assume that risk of collision exist with a vessel crossing ?

A 15-4
Par. 15.2, Crossing situation, last paragraph.


Q 15-5
When there is risk of collision between two vessels crossing, which one is the stand-on vessel and which one is the give-way vessel ?

A 15-5
Rule 15 and Par. 15.3, Give-way vessel.


Q 15-6
When there is risk of collision between two vessels crossing, which ves­sel shall keep out of the way ?

A 15-6
Rule 15 and Par. 15.3, Give-way vessel.


Q 15-7
When there is risk of collision between two vessels crossing, what ac­tion should the give-way vessel take ?

A 15-7
Rule 15 and Par. 15.3, Give-way vessel.


Q 15-8
What is the most adequate give-way action when two power-driven ves­sels are crossing ?

A 15-8
Par. 15.4, Action by give-way vessel, first paragraph.

Click on adequate give-way action for a summary
Click on adequate give-way action for an animation


Q 15-9
What should you do in a crossing situation if it is impossible to pass astern of another vessel ?

A 15-9
Par. 15.4, Action by give-way vessel, second paragraph.

Click on impossible to pass astern for a summary
Click on impossible to pass astern for an animation


Q 15-10
What action should be avoided if the circumstances of the case admit, in a crossing situation if there is risk of collision ?

A 15-10
Rule 15 and Par. 15.4, Action by give-way vessel, third paragraph.
Click on action to be avoided for a summary


Q 15-11
When would, in a crossing situation with risk of collision, a substantial alteration of course to port, be the best avoiding action ?

A 15-11
Par. 15.4, Action by give-way vessel, third paragraph.

Click on alteration to port for a summary
Click on alteration to port for an animation


About 1500 slides and 50 animations are available on our DVD Colregs Presentation which can be purchased online (click on books or read the books).