Fit Comes Before Features

Walk along any marina pontoon and you will see life jackets worn loose, unclipped, or with straps trailing in the wind. On a powerboat travelling at forty knots, a loose jacket is close to useless. The first wave that hits you can float the jacket up over your head, leaving your face in the water and your arms pinned behind your back. Before you worry about buoyancy ratings, spray hoods or which brand looks best, get the fit right.

Put the jacket on over the clothing you actually wear afloat — a drysuit in winter, a fleece and smock in summer. Adjust the waist and chest straps until the jacket sits snug against your ribcage, with the buoyancy panels high on the chest rather than down near your stomach. Then ask someone to grab the shoulders and lift firmly. If the jacket rides up past your ears, it is too loose, whatever the label claims. A well-fitted jacket lets you move freely at the helm and still stays put when you go in.

Automatic or Manual Inflation?

For most UK powerboating, an automatic life jacket is the right answer. Accidentally entering the water from a moving boat usually means cold shock, disorientation and no time to pull a toggle, so you want the jacket working before you have thought about it.

There are two main automatic mechanisms. Cap-and-bobbin types fire when a soluble element gets wet, which makes them quick but also prone to triggering in heavy spray or driving rain. Hydrostatic types fire only when the jacket is submerged under roughly ten centimetres of water, so a soaking on deck will not set them off. If you run an open cockpit boat that takes water over the bow, the hydrostatic option is worth the extra cost.

Manual jackets have their place — dinghy sailors and paddleboarders who expect to get wet often prefer them — but they are a poor choice for offshore powerboat crews. Whichever you choose, check the oral inflation tube before every trip. It is your backup if the cylinder has already discharged or the mechanism fails.

• 150N automatic: the sensible default for coastal cruising, day trips and most racing in sheltered or moderate conditions.
• 275N automatic: offshore passages, winter sailing in heavy gear, and anyone wearing bulky foul-weather clothing that traps air.
• 50N foam buoyancy aid: fine in a sheltered estuary for a small tender, but not suitable for offshore powerboat use.

Crotch Straps: the Cheapest Safety Upgrade

If your life jacket does not have a crotch strap, fit one. It costs very little and it is the single most effective addition you can make. A strap running between the legs prevents the jacket riding up when you hit the water at speed, and it keeps the buoyancy where it belongs — around your chest and neck.

Look for a wide, padded strap that sits comfortably and does not chafe when you are seated in a bolster. Two straps are better than one on a 275N jacket. Check the stitching and the buckle every time you wear it, and make sure the strap is adjusted so the jacket still sits correctly without being uncomfortably tight when you are standing at the wheel.

Harnesses and Tethers

A life jacket harness and a separate climbing-style harness do different jobs. For powerboating, an integrated harness built into the life jacket is generally the neatest solution, with a strong webbing loop on the front. Any harness you use should meet the relevant standard and be inspected for wear along the whole length of the webbing.

Tethering on a fast powerboat needs thought. On a yacht, clipping on to a jackstay keeps a crew member aboard. On an open high-performance craft, a tether that is too long can leave you being dragged alongside at thirty knots — far more dangerous than staying with the boat untethered. Where harnesses are used, keep the tether short, attach it to a properly engineered strong point, and choose a quick-release shackle you can operate under load with one hand. Many offshore race crews prefer to stay untethered but remain inside the cockpit, wearing helmets and padded gear instead. Decide your policy before you leave the dock and brief everyone aboard.

Clothing for British Conditions

UK sea temperatures sit between about six and sixteen degrees Celsius through the year, so cold shock and hypothermia are real risks even in summer. Dress for immersion, not for the car park.

• Summer coastal: base layer, fleece, lightweight waterproof smock, and a 150N automatic jacket.
• Spring and autumn: add a wetsuit or dry trousers, gloves, and a decent fleece mid-layer.
• Winter and offshore: a full drysuit with thermal undersuit, neoprene gloves, a thermal hood, and a 275N jacket with spray hood and light.

A spray hood and a personal light are not luxuries. Neither is a whistle. Make sure your jacket has a lifting loop for a rescue strop, and that anyone crewing with you knows where it is.

Servicing, Storage and Replacement

An inflatable jacket is a piece of safety equipment with a service life, not a permanent fixture. Check it before every trip: cylinder tight, indicator green, no corrosion, no frayed webbing. Rinse it in fresh water after a salty day, dry it thoroughly, and store it loose — never compressed in a locker — somewhere cool and out of direct sunlight.

Have the jacket serviced annually by a competent person, or follow the manufacturer's interval if it differs. Replace the firing mechanism and cylinder as specified, and take the whole jacket out of service if the fabric is damaged, the stitching is failing, or it has been inflated in anger. Keep a record of the service date on the jacket itself. Your life jacket is the cheapest crew member you will ever insure — look after it, and it will look after you.