Which type of device is classified as Type 4?

The classification of Type 4 devices refers specifically to throwable devices, which are not intended to be worn but can be thrown to a person in distress in the water. Examples of Type 4 devices include cushions, rings, and other buoyant items that can be grabbed by an individual who has fallen overboard, thereby aiding in rescue efforts.

These devices are important for safety and compliance with boating regulations, as they provide an additional means of assisting someone in the water without being worn directly. In contrast, the other choices represent wearable flotation devices, which serve different purposes and have their specific classifications, such as personal flotation devices (PFDs) designed to be worn at all times. Understanding the specific functions and requirements of each type of flotation device is crucial for ensuring safety while boating.