Final answer:
In reduced visibility, upon hearing a fog signal from another vessel 30° on your starboard bow, you should reduce speed, possibly alter course to starboard, and sound appropriate signals by COLREGs to prevent a collision, ensuring safety at sea.
Step-by-step explanation:
The question relates to the navigation rules that should be followed by vessels underway in reduced visibility, such as fog, where there's a risk of collision. When you hear a fog signal from another vessel about 30° on your starboard bow, the rules of the road, specifically Rule 19 of the International Regulations for Preventing Collisions at Sea (COLREGs), dictate taking immediate and decisive action to avoid a collision. The appropriate action would typically include reducing speed, altering course, and/or sounding the appropriate signal. Any action taken should result in passing at a safe distance, taking into account the movements of the other vessel and ensuring not cut across its bow or impede its passage.
Steps for Avoiding Collision:
Determine if a risk of collision exists by carefully assessing the movement and the fog signal of the other vessel.Slow down to a safe speed and prepare to take evasive action.Alter your course to starboard to pass behind the other vessel, if safe and practical.Sound the appropriate fog signal to indicate your actions to the other vessel.
In summary, when navigating in reduced visibility, it is critical to maintain vigilance by listening to fog signals and being prepared to act according to the COLREGs to ensure safety at sea.