Mariners Learning Practice Test

In restricted visibility, you must proceed at a speed that allows you to take proper and effective action to avoid a collision. Hearing a fog signal forward of your beam means another vessel could be ahead in the area you can’t clearly see, so you don’t yet know the risk. Reducing to bare steerageway—the minimum speed at which you can still control the vessel and maneuver—keeps you able to observe, react, and alter course or speed if a danger emerges. Staying at full speed would give you less time to respond and less maneuvering room if the other vessel’s position or actions become clearer. Stopping completely isn’t appropriate unless there’s an immediate, unavoidable danger that requires it. The phrase “slow to discretion” isn’t a standard operating speed in this context, whereas bare steerageway is the defined practice for maintaining control while assessing risk.