Which of the following is NOT a common type of ship communication system?

• A. Radio
• B. Telecommunication systems
• C. Morse code
• D. Satellite

Answer: (C)

Understanding how ship communication is categorized helps here: modern vessels rely on distinct systems for sending voice and data over varying distances, such as radio links (VHF/HF), satellite communications, and onboard telecommunication networks. Morse code, on the other hand, is a signaling method—an encoding of text that can be transmitted over those links. It is not a standalone type of ship communication system the way radio, telecommunication systems, or satellites are. While Morse code has historical importance and can be used with radio, it isn’t considered a separate, common system category in contemporary naval practice. Therefore, it’s the best answer because it’s a method, not a separate system type, whereas the other options represent actual categories of ship communication systems.