What is a recommended action for a stand-on vessel when another vessel is on her port side?

A stand-on vessel is one that has the right of way in a situation involving two vessels. According to the navigation rules, if another vessel is approaching a stand-on vessel from the port side, the stand-on vessel should maintain its course and speed, which includes avoiding any alteration of course to starboard. Altering course to port would be a violation of the navigation rules, as it could lead to confusion about the intended actions of both vessels.

In this context, maintaining a steady course (avoiding a change to port) is crucial because it helps to ensure predictability for both vessels involved. The stand-on vessel has the responsibility to keep its course and speed unless it is apparent that the give-way vessel is not giving way as required. By avoiding alteration to port, the stand-on vessel confirms its position and maintains safe navigation, thereby reducing the chance of a collision or misunderstanding between the vessels.