A manual ship-ship ARQ message typically begins with which sequence of ARQ procedures?

The correct sequence for a manual ship-ship ARQ message begins with the ship specific selective calling (selcal) procedure. Initially, the operator makes a call using the ship's selcal code, which identifies the intended vessel. Then, the operator utilizes the "HERE IS" phrase to introduce the calling ship, followed by the "WRU" command, which stands for "Where Are You?" This effectively prompts the receiving vessel to respond, confirming communication readiness, and allows for the subsequent exchange of messages.

This sequence is critical as it establishes the connection and confirms that both vessels are prepared for communication, making it an essential part of the marine communication protocol. The structure not only aids in initiating the conversation but allows for proper clarity and order in maritime communication, ensuring that both vessels are synchronized before the actual message is sent. Thus, following this specific order is vital to successful ARQ messaging between ships.