Which type of device is not considered a wearable personal flotation device?

A Type 4 flotation device is categorized differently than the other options because it is designed as a throwable device rather than a wearable one. This type of device includes items like buoyant cushions or life rings that a person can toss to someone who is in distress in the water. They are not designed to be worn, but rather to provide assistance to someone who may be in need of flotation.

In contrast, Types 1, 2, and 3 are all classified as wearable personal flotation devices. Type 1 jackets provide the most buoyancy and are intended for rough or open waters. Type 2 jackets are also wearable but are designed for more calm waters where immediate rescue is likely. Type 3 jackets are made for active sports and offer less buoyancy than Type 1 and Type 2 but are suitable for various water activities where movement is essential.

Understanding the classifications of flotation devices helps ensure safety on the water, as each type serves a specific purpose and is appropriate for different conditions and use cases.