Study Topics
Boats in Action Section Quiz Site Map
Navigation Sounds
Animations for Proper Sound Signals

Click on the links below to view the navigation sound animations:

Passing Sound Animations

Leaving the Dock Animation

Danger Signal Animation

Channel Obstruction Animation

Channel Obstruction Animation

Approaching a Bend or Channel Obstruction

Approaching a Bend or Channel Obstruction
A vessel nearing a bend in a channel or fairway where other vessels may be obscured by an intervening obstruction may sound one prolonged blast. If an approaching vessel that may be behind the obstruction hears the signal, it should be answered by one prolonged blast in response.

Note: These are not the only rules concerning sound signals in restricted visibility; there are additional rules concerning sound signals that may be found in the Rules of the Road or in Chapman's Piloting.