It's the Law: Required Equipment
Sound-Producing Devices
In periods of reduced visibility or whenever a vessel operator needs to signal his or her intentions or position, pursuant to the U.S. Coast Guard's Navigation Rules, a sound-producing device is required.
If on State Waters |
Less than 26 feet long (includes PWCs) |
Whistle, horn, or other mechanical sound device required |
26 feet long or longer |
Whistle, horn, or other mechanical sound device and a bell required |
If on Waters Under USCG Jurisdiction |
Less than 65.6 feet long
(includes PWCs) |
Whistle or horn audible for at least one-half mile required |
65.6 feet long or longer |
Whistle or horn and a bell audible for at least one mile required |
Common Sound Signals
 Some common sound signals that you should be familiar with as a recreational boater are as follows.
- A short blast lasts one second.
- A prolonged blast lasts 4-6 seconds.
Changing
Direction
- One short blast tells other boaters "I intend to pass you on my port (left) side."
- Two short blasts tell other boaters "I intend to pass you on my starboard (right) side."
- Three short blasts tell other boaters "I am backing up."
Restricted Visibility
- One prolonged blast at intervals of not more than two minutes is the signal used by power-driven vessels when underway.
- One prolonged blast plus two short blasts at intervals of not more than two minutes is the signal used by sailing vessels.
Warning
- One prolonged blast is a warning signal (for example, used when coming around a blind bend or exiting a slip).
- Five (or more) short, rapid blasts signal danger or signal that you do not understand or that you disagree with the other boater's intentions.
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