Nautical Know How - Sound Signals in Restricted Visibility

Sound Signals
Vessels are required to produce sound signals
under conditions of restricted visibility.

1 Prolonged Blast 1 Short Blast1 Stroke on the Bell
Vessel:	Time Interval:	Sound Signal:
1. Power driven vessel making way	Every Two Minutes
2. Vessel not under command, restricted in ability to maneuver, a vessel constrained by her draft, a sailing vessel, a vessel engaged in fishing and a vessel engaged in towing or pushing	Every Two Minutes
3. Power driven vessel underway but stopped and making no way	Every Two Minutes
4. Vessel at anchor less than 100 meters	Every Minute	5 seconds of rapid ringing
5. Vessel aground less than 100 meters	Every Minute	3 strokes 5 seconds rapid ringing 3 strokes