Answer :
Final answer:
The correct answer is c) Sound signaling device, which is a legal requirement for audible maritime communication for boats less than 39.4 feet in length.
Explanation:
All boats less than 39.4 feet in length must legally carry a sound signaling device to communicate with other boats. The correct answer to the student's question is c)
Sound signaling device. This device is essential for maritime communication, particularly in instances where boats are in close proximity to one another or when visibility is poor. Unlike radar reflectors, which enhance a boat's visibility to radar detection by reflecting radio waves, a sound signaling device is used for audible communication. Likewise, sonar technology operates based on the reflection of sound waves, primarily for detecting objects underwater or determining the ocean's depth. Yet, when it comes to immediate boat-to-boat communication in all visibility conditions, a sound signaling device is the legal requirement for boats under 39.4 feet.