sound signals

Nautical Sound Signals: The Prolonged Blast

Horns can be mouth-powered, hand-held, or fixed-mount, like this one, which has a DC-powered compressor to produce a 126 dB blast.

It’s a clear, sunny day, and you hear a 4- to 6-second blast of a ship’s whistle or horn. What should you do? Please, look for the source! This signal … [Read more...]



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