Question 17

The Correct Answer is D **Explanation for Option D (Correct):** Option D is correct because the regulations governing distress signals (specifically those listed in Annex IV of the International Regulations for Preventing Collisions at Sea – COLREGs, which apply both internationally and in inland waters where COLREGs are adopted) state that distress signals can be used individually or in conjunction with other authorized distress signals. For example, a vessel may continuously sound the fog-signaling apparatus *and* simultaneously display flames on the vessel *and* use an orange smoke signal. The purpose is to ensure the distress is clearly communicated and noticed by all available means. **Explanation for Incorrect Options:** **A) Is used to indicate doubt about another vessel's intentions:** This is incorrect. A distress signal indicates that the vessel is in grave and imminent danger and requires assistance. Doubt about another vessel's intentions is indicated by five or more short and rapid blasts of the whistle (the danger or doubt signal). **B) Consists of 5 or more short blasts of the fog signal apparatus:** This is incorrect. While five or more short blasts are used to indicate doubt (the danger signal), the official sound signal for distress is a continuous sounding of any fog-signaling apparatus (or the firing of a gun or other explosive signal at intervals of about a minute). **C) Consists of the raising and lowering of a large white flag:** This is incorrect. While flags are used for signaling, the visual distress signal involving flags is typically the display of the International Code Flag N hoisted above the International Code Flag C (NC signal). A large white flag being raised and lowered is not listed as an authorized distress signal in COLREGs Annex IV.