Question 1 AT01 - Assistance Towing Endorsement

The Correct Answer is D **Why option D is correct:** In maritime and inland waterway contexts, particularly with barges being moved or moored, a "check line" (or sometimes "checking line") is a heavy line or rope used specifically to restrict, slow, or stop the forward momentum (headway) of a vessel, such as a large barge, often when approaching a lock, dock, or when moving through a strong current. It is used to apply controlled tension to check the vessel's movement. **Why the other options are incorrect:** * **A) A line used to measure the overhead height of a bridge:** Measuring overhead clearance (air draft) is usually done using specialized instruments, navigational charts, or radar/sonar, not typically a general-purpose "check line." * **B) A safety line attached to a man working over the side:** A safety line attached to personnel is typically called a lifeline, safety harness line, or tether, not a "check line." * **C) A line used to measure water depth:** A line used to measure depth is called a lead line or sounding line.