Final answer:
Sound-producing devices used on boats and ships may need to be Coast Guard approved, depending on their purpose and functionality.
Step-by-step explanation:
Sound-producing devices that are used on boats and ships are required to meet certain safety standards set by the Coast Guard. However, not all sound-producing devices need to be Coast Guard approved. The requirement for Coast Guard approval typically applies to devices that are used for signaling or communication purposes, such as horns, sirens, and radios.
These devices need to meet specific performance standards to ensure their effectiveness in emergency situations. For example, a Coast Guard-approved sound-producing device must be able to produce a certain decibel level and have a specific range of audibility.
It's important for boaters and ship operators to check the regulations of their respective countries or regions to determine whether a specific sound-producing device needs to be Coast Guard approved.