What would indicate that a vessel is signaling for assistance using signal flags?

The indication that a vessel is signaling for assistance using signal flags is represented by hoisting the International Code flag 'N'. In maritime communications, the flag 'N' is part of the International Code of Signals, where it stands for “No” or can indicate a distress signal when used in specific contexts. When this flag is raised, it communicates a clear message to other vessels that the signaling vessel requires assistance or is in distress.

In contrast, waving a white flag traditionally signifies surrender or a request for a ceasefire in naval terms, rather than a call for help. Showcasing three red flags, while it suggests a form of alarm or danger, does not have an established meaning in the context of signaling for assistance through the International Code. Displaying a yellow flag usually denotes quarantine or a health-related warning, rather than a direct distress signal asking for help. Thus, the use of the International Code flag 'N' is the recognized and standardized method for a vessel to indicate that it is seeking assistance.