Sailors and ship captains take the sound of a
foghorn as a warning. The low, loud sound of a
foghorn may be heard repeatedly on days with
dense fog near the coast. In the event that
mariners are approaching a rocky coastline or
other obstacles that can't be seen due to fog,
the alarm will sound.
Allow for the employment of a gun or other
explosive signal fired at approximately minutely
intervals to indicate a ship's distress and need for
assistance.
Maneuvers and Warnings, Power-driven vessels
within visual range of one another are eligible
for signals. Vessels in a restricted channel or
fairway are subject to the overtaking
regulations. Sound Signals in Restricted
Visibility, applies during the day or night in or
near locations with limited visibility. However,
nighttime darkness is not included in this. Sets
of guidelines, a single second constitutes a
"short explosion," whereas four to six seconds
constitute a "prolonged blast."It is required that
sound signals be audible for at least 0.5 miles.
As a recreational boater, it is important for you
to be familiar with the following sound signals.