This is an essential piece of any survival kit and a must to keep around your person when out and about walking, fishing, boating etc.

A basic (no moving parts to go wrong) high-pitched and tactically-coloured whistle which floats on water and, in an emergency, could turn out to be the best quid (or thereabouts) you have ever spent.

• For an SOS scenario - an internationally recognised distress signal - blow three short blasts followed by three long blasts and then three short blasts again.
• Repeat.

Kev says: "They even have a little lanyard to secure to your clothing, ideally to be placed inside of an easy-reach / access pocket, just in case!"