Why are Type IV throwable devices required on boats 16 feet or longer?

Type IV throwable devices are required on boats 16 feet or longer because they serve as a backup flotation device. In an emergency situation, having a throwable device on board provides an additional safety option for swimmers or individuals who may fall overboard. These devices are designed to be thrown to someone in the water, allowing them to grab onto it and stay afloat while awaiting rescue.

This requirement enhances the overall safety of boating by ensuring that vessels have a means to assist persons in distress, particularly on larger boats where the number of people on board may increase the likelihood of someone needing immediate flotation support. The presence of a throwable device can be crucial in aiding rescue efforts and can help prevent drowning.

While storage ease and buoyancy are important considerations in boating safety equipment, the main purpose of a Type IV throwable device is specifically to act as a backup flotation option when immediate assistance is necessary.