Whistles are small, lightweight, and can be a lifesaver in an emergency. I probably own half a dozen or so Fox 40 whistles. I’ve used a number of Fox 40s for years, for both work and on the river and they can be found on my PFD, rucksacks and keys. In fact it is one of the few things that I am prepared to have hanging on my PFD.
In an emergency situation on a river it may not be possible to hear people shout clearly as the sound of the water can drown out the quality of the sound. However a good whistle can punch through that. The Fox whistle is highly regarded and is probably one of the loudest and compact whistles on the market. My orignal one must be well over 20 years old and has taken a beating (it’s the whistle in the image) but is still absolutely as loud and functional as the day I bought it.
There are no moving parts and nothing that could actually fail. The Fox 40 delivers optimum performance and sound power (115db) in a surprisingly small, compact and functional package. Given how good it is you’d expect the Fox 40 to be quite expensive. In reality you can pick them up for around £7 or less.