Question 46 ONC03 - Master LT 500-1600 GRT

The Correct Answer is D. ### Explanation for Option D ("All of the above") The fog signal of **one prolonged blast followed by two short blasts** is specified in Rule 35(c) of both the International Regulations for Preventing Collisions at Sea (COLREGs) and the Inland Rules. This signal is used by certain vessels that are either non-maneuvering, difficult to maneuver, or cannot get out of the way of other traffic easily. * **A) A vessel restricted in its ability to maneuver (RAM):** Rule 35(c) specifically requires vessels restricted in their ability to maneuver to use this signal. (Note: Even if they are at anchor, the RAM signal replaces the standard anchor signal because their restricted status is the most important information to convey.) * **B) A sailing vessel underway:** Rule 35(c) requires a sailing vessel to use this signal. * **C) A vessel not under command (NUC):** Rule 35(c) requires a vessel not under command to use this signal. Since options A, B, and C all correctly identify vessels that are required to sound one prolonged blast followed by two short blasts in restricted visibility, **All of the above (D)** is the correct choice. --- ### Why A, B, and C are Incorrect (as sole answers) While A, B, and C are correct in stating that these specific vessels use the prescribed signal, they are individually incorrect as the answer to the multiple-choice question because they are not exhaustive. The question asks which vessel(s) are required to sound the signal, and since the requirement applies equally to A, B, and C, selecting only one would exclude other correct vessels listed in the options.