Signal whistle
Also: whistle, rescue whistle
On the water a whistle is louder than any voice. It belongs on your PFD.
In a group, agree on simple signals, for example one blast for attention and three blasts for an emergency.
Matching gear
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Hiko signal whistle* (advertising, external link, opens in a new window)
Sources and further reading
Research as of 13 Nov 2026. We have marked manufacturer information as such.