In foggy conditions, if you are unsure of the intentions of another vessel, what should be your course of action?

In foggy conditions, where visibility is significantly reduced and the intentions of other vessels are uncertain, it is essential to take a conservative approach to ensure safety. Assuming the vessel will not alter course reflects the principle of caution in navigation. This mindset allows you to prepare for the possibility that the other vessel may continue on its current path, which helps in avoiding potential collisions.

Maintaining this conservative assumption encourages vigilant observation and allows for timely maneuvering, should the situation necessitate it. The decision to act with this level of caution is rooted in the navigation rules that emphasize the importance of being prepared for the actions of uncertain vessels, which is particularly critical in reduced visibility scenarios. By adopting this strategy, you increase the safety of your vessel and maintain a responsible approach to navigating in challenging conditions.

The other options, such as sounding a continuous blast or signaling with a visual display, might be appropriate actions but do not directly address the core principle of assuming a defensive posture in the face of uncertainty about another vessel's intentions.