When shall a vessel be deemed to be overtaking another vessel?

A vessel is deemed to be overtaking another vessel when it approaches from a direction more than 22.5 degrees abaft the other vessel's beam. This definition is significant within the context of the rules for handling navigation situations, primarily established by the COLREGs (International Regulations for Preventing Collisions at Sea).

When a vessel is positioned more than 22.5 degrees abaft the beam of another vessel, it indicates that it is approaching from the rear quarter of the vessel being overtaken. This is important because, under the COLREGs, the vessel that is being overtaken is not required to maintain its course or speed, allowing the overtaking vessel to maneuver safely.

Understanding this concept is crucial for safe navigation, as it helps seafarers recognize responsibilities and actions that should be taken in overtaking situations to avoid collisions and ensure safe passage. Other options do not correctly define the overtaking scenario as per the established regulations; they either restrict the angle of approach or do not account for the dynamics of relative motion between vessels.