Question 49 OSV01 - Master/Chief Mate - Offshore Supply Vessels

The Correct Answer is C The vessel is in distress. **Explanation for C (Correct Answer):** The firing of a gun or apparatus for an explosive signal at intervals of approximately one minute is a specific, internationally recognized distress signal defined in Rule 37 and Annex IV of the International Regulations for Preventing Collisions at Sea (COLREGs). This signal is used when a vessel is in grave and imminent danger and requires immediate assistance. **Explanation for A (Incorrect):** The firing of a gun at one-minute intervals is a distress signal, not a standard sound signal used for maneuvering, meeting, crossing, or overtaking (passing signals). Passing signals are short and long blasts of the whistle (e.g., one short blast means "I am altering my course to starboard"). **Explanation for B (Incorrect):** While a vessel in distress may eventually necessitate other vessels clearing the immediate area to facilitate rescue operations, the *primary meaning* of the one-minute gun signal itself is "I need help" (distress), not a command for all vessels to evacuate the area. Distress signals solicit aid. **Explanation for D (Incorrect):** A vessel repeatedly firing a gun is signaling a severe emergency. This signal indicates danger, risk, and a critical need for assistance, directly contradicting the meaning of "All is clear and it is safe to pass."