Who has authority to speak on radiotelephone channels for a vessel?

• A. The command's designated radiotelephone user
• B. Any crew member on board
• C. The vessel owner
• D. The harbor master

Answer: (A)

In maritime communications, the person who speaks on the vessel’s radiotelephone channels is the one the command designates to handle radio duties. This designated radiotelephone user is the official operator for the vessel, trained to use proper call signs, channel procedures, and emergency phrases. Having a specific person responsible creates a clear line of command and accountability; messages are transmitted by someone authorized to represent the vessel, which helps prevent confusion or incorrect information from being sent.

Other people aboard aren’t automatically permitted to transmit as the vessel’s representative. The harbor master interacts with you for coordinating traffic and safety in port, but they don’t speak for your vessel. The vessel owner isn’t automatically the radio operator either; the authority to transmit on behalf of the vessel rests with the person the command has assigned to the radio duties.