Which method is considered the most visual form of signaling in maritime communications?

The method recognized as the most visual form of signaling in maritime communications is flag hoisting. This technique utilizes flags to convey messages between ships and between ships and shore, making it highly effective for visual communication. Each flag represents a letter or a specific message, allowing for a wide range of information to be shared without the need for sound. The visibility of flags, especially in bright conditions or when there is clear line of sight, is essential in maritime contexts, where sound signals may not be as discernible or may be affected by environmental factors like wind or waves.

While other options like sound signals and whistle signals are important for communication, they primarily rely on auditory recognition rather than visual cues. Luminous buoys also serve a purpose, but they typically provide navigational aids rather than facilitate direct communication. Thus, flag hoisting stands out as the most visually impactful method in maritime signaling.