The perfect pal for when you fall off your ride into the deep waters, this whistle can alert your crew onboard, so they can slow and pull back around to pick you up. However, these whistles are not just for marine use. Emergencies come when you least expect them, and having a whistle on you at all times, can offer the panic a certain calm that is better than being out "there" without it. So whether alone or buddied up to explore the outdoors, these whistles can be a life saver.