What would a mariner likely do if encountering a buoy with a malfunctioning light?

When a mariner encounters a buoy with a malfunctioning light, they are likely to take the situation seriously due to the importance of buoys in navigation. Reporting the issue to authorities is essential as it helps ensure that the problem is addressed, preventing potential hazards for future navigators. Notifying the relevant maritime authority can lead to repairs or maintenance that restore the buoy’s operational status.

In addition to reporting the issue, a mariner would also need to identify alternative navigation methods. This could involve using other navigational aids, chart plotting, or adjusting the vessel's course to compensate for the lack of information that the buoy would ordinarily provide. The buoy's purpose is to mark hazards or provide guidance; without its proper functionality, the mariner must proactively ensure safety by utilizing other navigation strategies.

Therefore, the most comprehensive and responsible course of action involves both reporting the malfunction and considering alternative navigation methods, making this combination the correct response in such a situation.