What type of communication equipment is used by the Officer of the Deck?

The Officer of the Deck (OOD) is responsible for the safe and efficient operation of the ship while in port or at sea, which necessitates effective communication with both the crew and other departments. The correct choice encompasses the primary communication tools utilized in these operational contexts.

The 1MC is the ship's intercom system, essential for ship-wide announcements and immediate communications that need to reach all personnel. The telephone provides a direct line for one-on-one communications or coordination with various departments on the ship, which is crucial for operational directives and immediate concerns. The radio is another vital form of communication, especially for external interactions or in urgent situations requiring coordination with other vessels or shore-based stations.

Together, these tools ensure that the Officer of the Deck can manage operations effectively and maintain situational awareness, which is key to fulfilling their duties. The other options either include equipment that is less relevant to the OOD's responsibilities or are not commonly used in operational environments, making this combination of tools the most suitable for the roles and responsibilities of the Officer of the Deck.