Question 16 AT01 - Assistance Towing Endorsement

The Correct Answer is A **Explanation for Option A (Directly astern and pushing the tow):** Directly astern and pushing the tow (often referred to as 'push towing' or operating a 'towboat' with barges) is the most effective method for towing and maneuvering in restricted, inland waters like rivers, canals, and harbors where wave action is limited. This method is superior because: 1. **Maneuverability and Control:** When pushing, the entire unit (towboat and barge/tow) acts as a single, rigid vessel. This configuration provides the maximum directional control, allowing the pilot to steer precisely and execute tight turns, which is crucial for navigating narrow channels, bends in rivers, and maneuvering through bridge spans or locks. 2. **Efficiency:** Pushing significantly reduces hydrodynamic resistance (drag) compared to pulling, as the tug's wake does not interfere with the towed vessel, leading to better fuel efficiency. 3. **Stopping Power:** The towboat's propellers can be immediately reversed, using the pushing vessel's power to rapidly slow or stop the entire combined unit. **Explanation of Why Other Options Are Incorrect:** * **B) Towing alongside and parallel to the vessel it is towing (Towing alongside):** While this method offers good control and is sometimes used for short distances or moving single vessels in harbors, it is generally less efficient and provides slightly less directional control than push towing (A) when moving long tows through narrow, restricted channels. It is not the *most* effective method for long-distance river transit. * **C) Towing on the hip (Assisting on the hip):** This is a specific type of alongside towing, often used when a tug is assisting a powered vessel (like a ship docking) by tying directly alongside its stern quarter. It is excellent for precision movement (docking/undocking) but is a supportive role, not the primary, most effective method for moving bulk tows down a river system. * **D) Towing on a hawser (Towing astern):** This involves pulling the tow behind the tug on a long line. While common in open ocean towing where stability against waves is required, it is the *least* effective method in restricted waters. A hawser tow has very poor maneuverability, as the tow tends to wander or "yaw," making it extremely difficult and dangerous to navigate bends, bridges, and strong currents in a river environment.