What should a vessel do when detecting another vessel using radar in low visibility?

When a vessel detects another vessel using radar in low visibility, it is essential first to determine if a risk of collision exists. This process involves analyzing the radar data to assess the relative motion and distance of the other vessel, allowing the operator to make informed decisions to ensure safe navigation.

By evaluating the potential for a collision, the vessel can take appropriate action, such as altering course or speed, to avoid any dangerous situations. This proactive approach aligns with the International Regulations for Preventing Collisions at Sea (COLREGs), emphasizing the importance of maintaining situational awareness and making navigational decisions based on available information.

In contrast, maintaining course without regard to detected vessels, sounding a prolonged blast without evaluating the situation, or reducing speed without understanding the risk could lead to unsafe scenarios. Navigating in low visibility conditions requires careful consideration and adherence to navigation rules to prevent collisions and protect all vessels involved.