BOATsmart! Base de connaissances du Canada
Module 07 - Emergency Preparedness
Portable Horn / Whistle
You can use a portable horn or whistle to signal distress by continuously sounding it in one minute intervals. You can also signal S.O.S. by sounding three short blasts, then three long blasts, followed by three short blasts.
Other sound signalling devices
You can signal distress by continuously sounding a fog-signalling device. You may also use a gunshot or other explosive sound-emitting device fired at one minute intervals.
