Final answer:
When your vessel is being passed (overtaken) by another vessel, you are required to maintain your course and speed.
Step-by-step explanation:
When your vessel is being passed (overtaken) by another vessel, you are required to maintain your course and speed. This means that you should not stop or change your course abruptly, as it can cause confusion and potential collisions. Instead, you should continue on your current path and allow the passing vessel to safely move past you.