Question 1 RVR03 - Mate of LT 500-1600 GRT

The Correct Answer is B **Explanation of Option B (Correct):** Option B is correct because it directly reflects the requirements found in both the International Regulations for Preventing Collisions at Sea (COLREGs) and the Inland Rules, specifically Rule 19 (Conduct of vessels in restricted visibility). Rule 19(e) states that if a vessel detects the presence of another vessel by radar alone (or by hearing a fog signal, which strongly implies proximity in restricted visibility) and determines that a close-quarters situation is developing, or that risk of collision exists, the vessel **shall take all way off** and in any event navigate with extreme caution until the danger of collision is over. Taking "all way off" means reducing speed to bare steerageway or stopping completely, if necessary, to assess the situation safely. **Explanation of Other Options (Incorrect):** * **A) stop your engines:** While stopping the engines might be part of taking all way off, it is not the required action itself. The primary requirement is to eliminate speed (way). Simply stopping the engines does not guarantee the vessel immediately loses its momentum ("way"). Furthermore, maintaining steerageway (minimal engine use to maintain direction) might be necessary, meaning stopping the engines completely could be dangerous if it causes loss of control. The rule requires taking all way off, which might or might not involve stopping the engines entirely. * **C) begin a radar plot:** While sound navigational practice dictates that a continuous radar plot or equivalent systematic observation should already be underway in restricted visibility (Rule 5 & 7), the immediate mandated action upon detecting risk of collision via a fog signal is not to *begin* plotting (which assumes it wasn't already happening), but rather to drastically reduce speed or stop. Plotting is a prerequisite for making a proper assessment, not the required maneuvering action under Rule 19(e) upon confirmation of risk. * **D) All of the above:** Since options A and C are not the specific, mandatory action required by Rule 19(e), this option is incorrect.