Question 177Navigation General

The correct answer is C) blue and white sign showing the radio's channels. Drawbridges equipped with radiotelephones are required to display a blue and white sign showing the radio's operating channels, as per the U.S. Coast Guard regulations. This allows vessels approaching the drawbridge to quickly identify the appropriate radio channel to communicate with the bridge operator and coordinate the safe passage through the draw. The other answer choices are incorrect because they do not accurately describe the required signage for drawbridges with radiotelephones. Option A refers to a sign for vessel identification, option B describes a day signal for visual identification, and option D is not a standard marking for radiotelephone-equipped drawbridges.