In what situation is a power-driven vessel considered to be "overtaking" another vessel?

A power-driven vessel is considered to be "overtaking" another vessel when it approaches from behind and proceeds to move past that vessel. This definition is rooted in the navigation rules that outline the responsibilities of vessels, particularly regarding the right of way. In an overtaking situation, the vessel that is being overtaken does not have the obligation to alter its course or speed since the overtaking vessel must take action to avoid a collision.

The other situations described do not meet the criteria for overtaking. When a vessel sails parallel to another, it remains in a similar course rather than approaching from behind, which does not constitute overtaking. If both vessels are moving at the same speed, neither is overtaking the other since their relative positions remain unchanged. Lastly, if a vessel intersects the course of another, it may indicate a crossing situation rather than overtaking, where different navigational rules apply regarding vessel priority and responsibilities. Thus, the clearly defined overtaking situation is the one where the power-driven vessel approaches and passes another from behind.