What should TAC Crew members rely on when signaling other vessels visually?

When signaling other vessels visually, TAC Crew members should rely on flags and sound signals because these methods are standardized and universally recognized within maritime communication. Using flags allows crew members to convey specific messages through visual symbols, with various colors and patterns representing different meanings. This is crucial in maintaining safety and ensuring effective communication in a busy marine environment.

Sound signals complement visual signals, particularly in situations where visibility may be compromised, such as fog or heavy rain. By utilizing sound signals, crew members can alert nearby vessels of their presence and intentions, which is essential for navigating safely and avoiding collisions.

In contrast, other options such as color coding of equipment and automated systems are not primarily used for signaling other vessels. Personal communication devices, while useful for communication among crew members, do not serve the same purpose as visual signaling methods meant for broader maritime communication. Therefore, relying on flags and sound signals ensures clarity and adherence to established maritime protocols, promoting safety on the water.