Question 11 OSV01 - Master/Chief Mate - Offshore Supply Vessels

The Correct Answer is B. Option B ("required to maintain course and speed in a crossing situation but may take action to avoid collision") is correct because it accurately reflects the responsibilities of the stand-on vessel under both International and Inland Rules of the Road (COLREGs). Rule 17 (Action by the Stand-on Vessel) states that the stand-on vessel shall keep its course and speed. However, Rule 17(a)(ii) permits the stand-on vessel to take action to avoid collision as soon as it becomes apparent that the give-way vessel is not taking appropriate action. Furthermore, Rule 17(b) mandates that the stand-on vessel *shall* take action when collision cannot be avoided by the action of the give-way vessel alone (i.e., they are required to act as a last resort). Here is why the other options are incorrect: A) **required to give-way in a crossing situation:** This is the definition of the *give-way* vessel (the vessel on your port side, or the vessel that is required to keep clear), not the stand-on vessel. The stand-on vessel's primary duty is to maintain course and speed. C) **required to sound the first passing signal in a meeting situation:** In a meeting situation (head-on), neither vessel is strictly "stand-on" or "give-way." Both vessels are required to take action to pass port-to-port (or starboard-to-starboard if safe and agreed upon). Passing signals (one or two short blasts) are initiated by the vessel taking the action (e.g., turning to starboard) and indicate the intent of the maneuver, not the right-of-way status. D) **free to maneuver in any crossing or meeting situation as it has the right of way:** While the stand-on vessel has the "right of way" (the duty to maintain course and speed), it is **not** free to maneuver. Its duty is explicitly to maintain course and speed to make the give-way vessel's job predictable. Maneuvering is only permitted or required if the give-way vessel fails to act or if collision is imminent.