An icebreaker may use the code letter "K" to remind ships of their obligation to listen continuously on their radio. This signal may be made by any of the following EXCEPT __________.
• International Code of Signals (ICS) methods of transmission (flags, lights, sound, radiotelephony) • What the code letter “K” represents in ICS and how it can be sent • Difference between visual signals and radio communications
• List the standard ways an ICS letter signal (like “K”) can be transmitted between ships and see which option does not fit that pattern • Ask yourself whether “visual” is a broad category and how “light” and flags fit under it • Consider which option depends on actual radio equipment rather than line‑of‑sight signaling
• Verify which methods are explicitly recognized in the International Code of Signals for sending a single-letter signal like “K” • Check whether light signal and visual signal are essentially the same thing in this context or if one is redundant as a separate answer • Confirm whether radiotelephone is treated the same way as flags/lights/sound in ICS, or if it’s categorized differently from traditional code signals
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