Please view the video on rules for any condition of visibility. Then see the material below on "constant relative bearing". Then go back to the main page and proceed to the next activity to take a practice quiz on this material.


The slides and text for this video are available in PDF format. 

Rule 7 clearly states that the risk of collision risk "shall be deemed to exist if the compass bearing of an approaching vessel does not appreciably change". This is also known as "constant relative bearing". This is illustrated in the following diagram:

Schematic of two vessels on constant relative bearing.

Last modified: Wednesday, 10 February 2021, 1:35 PM