A sound-producing device is required on all waters. It is essential during periods of reduced visibility or whenever a vessel operator needs to signal his or her intentions or position.
| If on State Waters |
| Less than 26 feet long (includes PWCs) |
Mouth-, hand-, or power-operated whistle or horn, or some other
means to make an efficient sound signal |
| 26 feet long or longer |
Whistle or horn, and a bell |
| If on Federally Controlled Waters |
| 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 |
Some common sound signals that you should be familiar with as a recreational boater are as follows. 
