When is a "stand-on vessel" allowed to take evasive action?

A "stand-on vessel" is defined within maritime navigation rules as the vessel that is required to maintain its course and speed when encountering another vessel in a crossing situation. However, if the stand-on vessel determines that a collision risk is present—especially in situations where the give-way vessel is not taking the necessary action—it is permitted to take evasive maneuvering when it is safe to do so.

This flexibility allows the stand-on vessel to respond to potential danger while still fulfilling its obligation to maintain its course and speed as a fundamental rule of these navigation scenarios. It acknowledges that while the stand-on vessel has the right of way, there can be instances where safety necessitates immediate action, particularly if the give-way vessel is not maneuvering appropriately.

Maintaining safety at sea is paramount; therefore, recognizing when to take evasive action, even as a stand-on vessel, reflects prudent seamanship and adherence to safe navigation practices.