4.2 Personal Flotation Devices & Lifesaving Appliances
Key Takeaways
- Type I offshore life jackets give the most buoyancy (22 lb adult) and are the only wearable that turns most unconscious wearers face-up.
- A Type IV is thrown, never worn, and cannot count toward the wearable-per-person requirement; a Type V counts only if worn.
- EPIRBs transmit a registered 406 MHz distress signal to the COSPAS-SARSAT satellite system; Category I units float free and self-activate at about 4 m depth.
- Immersion (survival) suits sharply extend cold-water survival time and should be donned in under a minute.
- Lifesaving gear must be accessible, correctly sized, and serviceable - a life jacket sealed in plastic under a bench saves no one.
PFDs and Lifesaving Appliances
The personal flotation device (PFD) is the single most important survival item aboard - most boating fatalities are drownings, and the large majority of drowning victims were not wearing a PFD. The OUPV exam expects you to know the five PFD types, their buoyancy and best use, and the other lifesaving appliances a small commercial vessel carries.
The five PFD types
The Coast Guard now labels new PFDs with performance icons, but the exam still uses the classic Type I-V system:
| Type | Name | Min. adult buoyancy | Best use |
|---|---|---|---|
| I | Offshore Life Jacket | 22 lb | Open, rough, or remote water; turns most unconscious wearers face-up |
| II | Near-Shore Buoyant Vest | 15.5 lb | Calm inland water, quick rescue likely; turns some wearers face-up |
| III | Flotation Aid | 15.5 lb | Conscious wearer, calm water; will not reliably turn you face-up; most comfortable |
| IV | Throwable Device | 16.5-18 lb | Ring buoy or cushion thrown to a person; not worn |
| V | Special-Use Device | 15.5-22 lb | Inflatables, work vests, hybrid types; counts only if worn |
Two classic traps: the Type I is the most buoyant, the best in offshore or rough conditions, and the only wearable rated to turn most unconscious people face-up; and a Type IV is thrown, never worn, so it cannot be counted toward the one-wearable-per-person rule. A Type V is legal only while actually being worn.
Inflatable PFDs
Inflatable PFDs are compact and give 22-34 lb of buoyancy when inflated - more than a Type I - but they must be worn to count, and they require upkeep: check the CO2 cylinder, the inflation mechanism (automatic or manual), and the oral backup tube. Inflatables are not approved for children under 16 or for use on personal watercraft.
Throwable devices, ring buoys, and the Lifesling
A ring buoy (commonly 24- or 30-inch) with a floating line is the standard reaching device - throw it past and beyond the person, then draw it to them. Horseshoe buoys and buoyant cushions serve the same purpose. Many vessels also carry a Lifesling: a floating collar on a long line that is trailed and circled around a tired or injured swimmer, then used to hoist them aboard - a system one person can work alone.
Immersion (survival) suits
In cold water an immersion suit ("gumby suit") dramatically extends survival time by insulating the whole body and adding buoyancy; many commercial vessels in cold operating areas must carry one per person. The benchmark drill is to don a suit in under one minute, which only comes with practice - fumbling with an unfamiliar suit in the dark on a pitching deck is how the seconds are lost.
EPIRBs and PLBs
An Emergency Position-Indicating Radio Beacon (EPIRB) is your automated offshore call for rescue. It transmits a 406 MHz digital distress signal - carrying your registration data and, on modern units, a GPS position - to the COSPAS-SARSAT satellite system, which relays it to Coast Guard rescue coordinators.
- Category I: mounted in a hydrostatic release bracket; if the vessel sinks the beacon floats free and activates automatically at about 13 feet (4 m) depth.
- Category II: manual release and activation only.
You must register the EPIRB with NOAA (free) and keep it current - an unregistered beacon slows rescue because searchers cannot identify the vessel or reach your emergency contacts. A PLB (personal locator beacon) is a smaller, person-carried version registered to an individual rather than a vessel.
Stowage, servicing, and the passenger brief
Lifesaving gear only works if it is accessible and serviceable. Keep PFDs readily available (never locked away), sized for your passengers including children, and free of rot, tears, or oil-soaked fabric. Check inflatable arming status and replace expired hydrostatic releases and flares. Stow the throwable where the helmsman can reach it in seconds. Before getting underway, brief passengers on where the PFDs are and how to put them on - the briefing is a required part of running a safe passenger operation and turns dead-weight equipment into a working survival system.
Which statement about a Type IV PFD is correct?
A Category I EPIRB differs from a Category II EPIRB primarily in that it:
For an unconscious person in open, rough offshore water, which wearable PFD gives the best protection?