What does external communication onboard include?

External communication onboard primarily focuses on the ways a naval vessel communicates with entities outside of its own systems and personnel. This includes various methods that convey information to other ships, aircraft, and shore-based facilities.

Visual methods for communication often include signals that can be sent via flags or lights, which are crucial for conveying messages to other ships or units in a complex maritime environment. Furthermore, the Allied Tactical Publication serves as a standardized guide that can assist with external communications among allied forces, ensuring that all parties have common understanding and procedures. This aspect of external communication is vital for coordinating operations, clarifying intentions, and sharing important tactical information, especially in collaborative or multinational missions.

In contrast, options mentioning internal messaging systems, engine reports, or cargo manifest sharing do not represent external communication. Internal systems handle communications within the ship itself, and reports related to machinery or cargo are typically utilized for operations and management within the ship, rather than for communicating with external entities.