Once ARQ communication with a coast station has been established, what typically happens next?

In ARQ (Automatic Repeat reQuest) communication, after a connection has been successfully established with a coast station, it is standard for the coast radio station to send a confirmation or command message. The specific transmission of "GA+?” indicates that the coast station is ready to receive messages and is prompting for the next action from the vessel. This step is integral in confirming that both the vessel and the coast station are synchronized and prepared for the exchange of information.

The transmission of "GA+?” acts as a readiness signal, facilitating a seamless communication flow between the vessel and the coast station. It signifies that the coast station is available to handle the communication, allowing the vessel to proceed with its intended message transmission or further actions. This command structure is crucial in ARQ communications to maintain clarity and efficiency in maritime communication protocols.