A whistle is an essential piece of safety kit to gain attention if in distress especially when out on water – it is very loud, waterproof and with no moving parts will always work.
The whistle comes supplied with a length of cord so that it can be secured to hand on a buoyancy aid or life jacket (do not wear around the neck whilst undertaking activities). Alternatively it has a clip for attachment to a belt or strap. Conforms to EN ISO 12402-8. Measures 7cms long.
3 short blasts, 3 long then 3 more short blasts.
Repeat after 1 minute interval.