The Bridge-to-Bridge frequency is VHF-FM Channel 13 (156.650 MHz). On this channel, who must guard the channel?

• A. The member directing the movement of the vessel (such as the conning officer)
• B. The vessel's navigator
• C. The radio operator on watch
• D. The senior deck officer

Answer: (A)

Bridge-to-Bridge is the channel used for coordinating ship movements with other vessels. The person in charge of directing the vessel’s movement—the conning officer or the officer on the bridge responsible for maneuvering the ship—must guard this channel. They need to issue and receive maneuvering instructions, passes, and changes in course or speed so that actions are coordinated and safe. The navigator focuses on charting and situational awareness rather than actively directing movement across the radio. The radio operator on watch handles communications equipment, but the duty to guard Bridge-to-Bridge rests with the person directing the vessel’s movement.