What is a correct action when in doubt about another vessel's intentions in limited visibility?

When navigating in limited visibility and unsure of another vessel's intentions, sounding the danger signal is a proactive measure to alert nearby vessels of your presence and concerns. This action is appropriate because it serves as a warning to others that you might be in a potentially hazardous situation.

In situations where visibility is poor, communication becomes vital. The danger signal, typically made by sounding a horn or whistle in specific intervals, conveys to other operators that caution is needed. The idea is to ensure that all vessels are aware of one another's positions, reducing the risk of collision.

While slowing down and waiting can be a prudent measure in some cases, it does not communicate your situation to nearby vessels. Holding your course and speed can be unsafe if there is uncertainty about the actions of other vessels, and signaling distress is only appropriate if you are in immediate danger, which may not always be the case in limited visibility. Therefore, sounding the danger signal emphasizes the necessity of clear communication and awareness on the water.