When is the Type III PFD normally worn aboard boats?

The Type III Personal Floatation Device (PFD) is specifically designed for users who are engaged in recreational activities on the water. It provides a level of buoyancy that supports users in maintaining a position while floating in calm conditions, which aligns perfectly with recreational use scenarios. This type of PFD is comfortable to wear for extended periods, making it ideal for activities such as fishing, kayaking, or having fun on a boat without the need for constant readiness that other PFD types may require during emergency situations.

While the other options describe situations that may require different types of PFDs or safety gear, they do not specifically align with the primary use of a Type III PFD, which is optimal for leisurely activities where the user is expected to be conscious and active rather than in a situation involving distress or severe weather. Therefore, the context provided here underscores why the PFD is best suited for recreational use.