Question 49

The Correct Answer is C Option C ("The signal cannot be mistaken for a signal authorized by the Rules") is correct because it directly reflects Rule 36 (Signals to Attract Attention) of both the International Regulations for Preventing Collisions at Sea (COLREGS) and the Inland Rules. Rule 36 states that any light or sound signal used to attract the attention of another vessel must be such that it **cannot be mistaken for any signal authorized elsewhere in these Rules** (such as maneuvering, warning, or distress signals). The primary purpose of this rule is to prevent confusion and ensure navigational safety, as ambiguous signals could lead to dangerous misunderstandings. **Why the other options are incorrect:** A) **Special flashing yellow lights may be used to attract the attention of another vessel:** This is incorrect. While some lights *may* be used, the use of a "special flashing yellow light" is specifically authorized only for air cushion vehicles, non-displacement craft, or certain law enforcement activities under Inland Rules, or is often associated with towing/pushing (Inland), or is generally prohibited for attracting attention because flashing lights are used as navigational aids or special signals (Rule 36 states that any light must not impair the visibility or distinctive character of any authorized navigation lights). B) **The signal may be the continuous sounding of a foghorn:** This is incorrect. A continuous sounding of a foghorn (or any sound apparatus) would be easily mistaken for a signal authorized by the Rules, specifically a restricted visibility signal (Rule 35) or possibly a distress signal (Annex IV). Rule 36 explicitly prohibits signals that can be mistaken for other authorized signals. D) **White lights are not used to attract the attention of another vessel:** This is incorrect. Rule 36 specifically allows for a light to be directed toward the danger, provided it does not impair the visibility of or interfere with the distinctive character of any authorized navigation light. White lights (such as searchlights) are frequently used in practice to attract attention (e.g., illuminating the vessel's deck or shining toward the danger), provided they comply with the restrictions of Rule 36.