Question 55 ONC03 - Master LT 500-1600 GRT

The Correct Answer is D **Explanation for Option D (All of the above) being correct:** The code letter "K" in the International Code of Signals (ICS) means, "I wish to communicate with you." However, in the context of an icebreaker directing convoys or navigating challenging ice conditions, the icebreaker often uses specific communications (sometimes non-standard but derived from ICS principles) to ensure vessel safety and coordination. Regardless of the specific meaning the icebreaker assigns to "K" (in this case, "listen continuously"), the instruction must be communicated effectively and reliably to all vessels in the vicinity, often simultaneously or redundantly. International maritime regulations (SOLAS, COLREGs, and ICS) prescribe three primary methods for signaling between vessels: 1. **Light Signal (A):** The Morse code representation of the letter "K" (dash-dot-dash) can be sent using a signaling lamp (e.g., Aldis lamp). This is a standard and effective means of communication, especially for short, unambiguous messages like single code letters, often used at night or in conditions where flags or radio might be less suitable. 2. **Sound Signal (B):** The Morse code for "K" (dash-dot-dash) can be communicated using the ship's whistle or horn. This is effective in fog, heavy weather, or when immediate attention is required. 3. **Visual Signal (C):** The actual code flag corresponding to the letter "K" (a vertical yellow and blue striped flag) can be hoisted. This is the simplest and most traditional method of communicating ICS code letters, relying purely on line-of-sight visual recognition. Since all three methods—light, sound, and flag (visual)—are legitimate and prescribed means under the International Code of Signals for communicating a single code letter like "K," Option D, encompassing "All of the above," is the correct choice. **Explanation of why other options are incorrect:** * **Option A (By light signal):** This is a valid method, but it is incomplete, as it excludes equally valid methods like sound and visual flags. * **Option B (By sound signal):** This is a valid method (using Morse code via whistle), but it is incomplete, as it excludes light signaling and visual flags. * **Option C (By visual signal):** This is a valid method (using the Code Flag K), but it is incomplete, as it excludes communication via light and sound signals.