What is the primary purpose of a Type IV flotation device?

A Type IV flotation device is primarily designed to provide buoyancy when thrown to someone in need. This type of device is often a throwable flotation aid, such as a ring buoy or a cushion, which is intended to be quickly deployed to assist people in distress in the water. The design and function of a Type IV flotation device ensure it can be easily thrown, allowing for immediate assistance without requiring the rescuer to enter the water.

In contrast, other options focus on aspects that do not align with the intended use of a Type IV device. For example, enhancing mobility, use in competitive boating, or serving as a tether suggest functionalities that are not relevant to the primary design and application of a Type IV flotation device. The core role of a Type IV device is straightforward: it is available for immediate retrieval and use, supporting individuals who may require help staying afloat until they can reach safety.