Fog Sound Signals | Fog, Reference book, Wooden boats
Marine Insight - There are different types of signals one can use onboard ships to indicate that your ship is in distress. Let us know in the comments what other distress signals
Navigation markers, sounds, lights and flags
Oregon State Marine Board : Sound Producing Devices : Boater Info : State of Oregon
An Easy Guide to Whistle Signals: What They Mean, How to Respond
Different Types of Alarms Used On Ships
Wondering what the different... - Fisheries Queensland | Facebook
which signal should I have used please? - Boat Handling - Canal World
What do six short blasts and one long blast mean from a ship horn? - Quora